A man who works on a tourist cruise boat takes a nap on the river Nile in Cairo April 22, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 22, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL)

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Two young girls wake up from a nap, as they rest on their family's fishing boat, on the river Nile in Cairo April 16, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 16, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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A woman washes clothes as she sits in a boat on the river Nile in Cairo April 24, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 24, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY ENVIRONMENT)

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A fisherman rows, while his daughter uses a net to fish, on their boat on the river Nile in Cairo April 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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A fisherman uses a net to fish while another man rows their boat on the river Nile in Cairo April 4, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 4, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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A girl rows her family's fishing boat on the river Nile in Cairo April 14, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 14, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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A man repairs a boat beside the river Nile in Cairo May 22, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 22, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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Workers repair a cruise boat in a workshop next to the river Nile in Cairo April 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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Workers launch a cruise boat after repairing it, at a workshop next to the river Nile in Cairo April 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL)

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A disabled man steers the wheel of a cruise boat on the river Nile in Cairo May 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL)

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A boat passes buildings under construction and the two towers of the Bank of Egypt building (R), overlooking the river Nile in Cairo June 7, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken June 7, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS CITYSCAPE)

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A small cruise boat passes Nile City Towers, which is owned by Naguib Sawiris the owner of Orascom Telecom, overlooking the river Nile in Cairo June 7, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken June 7, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS ENVIRONMENT BUSINESS CITYSCAPE TRAVEL TELECOMS)

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Women wash clothes in the river Nile in Cairo May 20, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 20, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY ENVIRONMENT)

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Men help a priest disembark from a river taxi on the river Nile April 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS RELIGION SOCIETY TRANSPORT)

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A fisherman rows his boat on the river Nile in Cairo April 13, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 13, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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A girl plays on the banks of the river Nile in Cairo April 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY ENVIRONMENT)

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A farmer stands near his cow while it drinks from the river Nile in Cairo May 22, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 22, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY ANIMALS AGRICULTURE ENVIRONMENT)

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Women wash dishes and children fish in the river Nile, in an area where many buildings lack basic utility services, in Cairo April 13, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 13, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY ENVIRONMENT)

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A girl looks at Cairo through a telescope from a Cairo tower, April 30, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 30, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL)

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Boys play on a ferry jetty on the shore of the river Nile in Cairo May 22, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 22, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRANSPORT)

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A boy jumps from a ferry into the river Nile in Cairo May 22, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 22, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRANSPORT)

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People sit in a cafe overlooking the barrages of al-Qanatir on the river Nile in Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS ENVIRONMENT)

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Boys run in the river Nile on the outskirts of Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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People sit on chairs set out by a cafe on the banks of the river Nile in Cairo April 21, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 21, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: BUSINESS POLITICS SOCIETY)

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A couple talk as they sit in a boat on the river Nile on the outskirts of Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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A couple talks as they sit on rocks on the banks of the river Nile on the outskirts of Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TPX IMAGES OF THE DAY)

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A man swims in the river Nile on the outskirts of Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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People swim in the river Nile to celebrate the spring holiday of Sham el-Nessim, on the outskirts of Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS ENVIRONMENT)

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People swim in the river Nile to celebrate the spring holiday of Sham el-Nessim, on the outskirts of Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS ENVIRONMENT)

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Couples walk in the river Nile as people celebrate the spring holiday of Sham el-Nessim on the outskirts of Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY ENVIRONMENT)

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A boy jumps into the river Nile as people celebrate the spring holiday of Sham el-Nessim on the outskirts of Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY ENVIRONMENT TPX IMAGES OF THE DAY)

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A boy swims in the river Nile in Cairo May 6, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 6, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY ENVIRONMENT)

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A boy washes his horse in the river Nile in Cairo May 22, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 22, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS CITYSCAPE ANIMALS)

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A worker fixes lamps close to an area where cruise boats dock, on the river Nile in Cairo May 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRANSPORT TRAVEL)

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A woman rows, while another holds a net as they fish in the river Nile in Cairo April 16, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 16, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS)

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A man stands in his cruise boat as he waits for customers on the river Nile in Cairo April 22, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken April 22, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL)

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A woman looks out as she sits in a boat during a cruise on the river Nile in Cairo June 7, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken June 7, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL)

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Boats sail on the river Nile in Cairo June 12, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken June 12, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS CITYSCAPE)

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People leave a boat after a cruise on the river Nile in Cairo May 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL)

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Boats sail past the burned out headquarters of former President Hosni Mubarak's National Democratic Party, on the banks of the Nile in Cairo June 12, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken June 12, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS CITYSCAPE)

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The 15th May bridge, which spans the river Nile, is seen as the sun sets over Cairo June 12, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken June 12, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS CITYSCAPE TRANSPORT)

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A ferry sails on the river Nile as the sun sets in Cairo May 12, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 12, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRANSPORT)

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A man cleans an area of pavement next to a cafe overlooking the river Nile in Cairo May 8, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 8, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS FOOD)

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A cruise boat sails past boats docked on the banks of the river Nile in Cairo May 8, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 8, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL TRANSPORT)

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Boats housing restaurants and nightclubs float on the river Nile in Cairo May 8, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 8, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS BUSINESS FOOD TRANSPORT TRAVEL)

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Ahmed and Shaimaa pose for pictures as they celebrate their engagement with a party on a boat, on the river Nile in Cairo May 5, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 5, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TPX IMAGES OF THE DAY)

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People walk up the banks of the river as they leave a cruise boat docked on the Nile in Cairo May 8, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 8, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL TRANSPORT)

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Boats housing restaurants and nightclubs float on the river Nile in Cairo May 8, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken May 8, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS TRAVEL)

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The 6th October bridge spans the River Nile in Cairo June 12, 2013. Most of Egypt's population live clustered around the Nile valley and delta, and the river is both a vital resource for the country's citizens, and a potent national symbol. In a recent dispute with Ethiopia over the construction of a dam upstream, Egypt's foreign minister Mohamed Kamel Amr underlined the country's reliance on the river's waters: "No Nile - no Egypt," he said. Picture taken June 12, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: POLITICS SOCIETY BUSINESS CITYSCAPE)

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