"850 m long: it is the largest beaver dam in the world. It was discovered in a remote and wild northern Canada, with satellite photos and software Google Earth. It would be a very old log dam, built by several generations of beavers since the 1970s. Located in the Wood Buffalo National Park (northern Alberta), it was already visible in photos NASA's from the early 1990s. Beaver Dam are few structures built by animals visible from space. "
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