PLANETOBSERVER / SCIENCE PHOTO LIBRARY PLANETOBSERVER / SCIENCE PHOTO LIBRARY
River Nile, satellite image. North is at top. This is the southern section of the River Nile. Sudan is at bottom, Egypt is at top. The large meander at the top of the image marks the site of the ancient city of Luxor, whilst the wider stretch of water below centre is Lake Nasser, formed by the Aswan High Dam. This dam was constructed in the 1960s, retaining 80 billion cubic metres of water for irrigation and producing 8 billion kilowatts an hour from its hydroelectric plant. It does however allow the silt to settle, leading to fertility problems and bank erosion.
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