Longest beaver dam

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850 meters (2,790 ft), Wood Buffalo National Park (Alberta, Canada) - The world's longest known beaver dam was discovered with Google Earth on October 2, 2007. Satellite photos from the 1990s and 70s would indicate that the dam was constructed by successive generations of beavers starting sometime after 1975. Because this part of Wood Buffalo National Park is flat, the beavers had to build a long dam to contain the wetland waters. A typical beaver dams stretches less than 100 metres.

WEB site :	http://www.geostrategis.com/p_beavers-longestdam.htm http://www.pc.gc.ca/eng/pn-np/nt/woodbuffalo/ne.aspx

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