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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