The world's largest beaver dam, half a mile long, still stands in Wood Buffalo National Park
The largest beaver dam on Earth stretches 2,790 feet through remote forest in Canada's Wood Buffalo National Park. It backs up a 17-acre lake. Landscape ecologist Jean Thie found the half-mile structure while reviewing satellite imagery in 2007. Scientists say the dam almost certainly remains the biggest anywhere, and the habitat it created now supports wild bison, wolves and breeding whooping cranes.
The dam gives whooping cranes, wild bison and migratory birds a wetland refuge that beavers built on their own.
Source: Deep in the Wilderness, the World’s Largest Beaver Dam Endures (e360.yale.edu).
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