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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