Explorers pinpoint source of the Amazon

By Sid Perkins, 15:47 PM April 15, 2008

The mighty Amazon River, a tropical torrent that carries about 20 percent of the fresh water that flows into the world's oceans, starts out as a trickling snow-fed stream.

That's what a five-nation team of explorers funded by the National Geographic Society found when they used the Global Positioning System (GPS) to survey five remote rivers in a 100-square-kilometer area in southern Peru last July.

After setting up a GPS base station and camp at an elevation of about 15,500 feet, small teams ...

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