In this Wednesday, April 15, 2015 photo, Sudanese fishermen sail through river algae while fishing on the Nile River on the outskirts of Khartoum, Sudan. The worldís longest river, the Nile courses through 11 countries, ending in Egypt and the Mediterranean Sea. Its main tributaries, the Blue and the White Niles, meet just north of Khartoum. (AP Photo/Mosa'ab Elshamy)
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