850 meters long more than 12 feet high Wikipedia Beaver dam Beaver dam 댐 dams dams Wikipedia beaver dams https://en.wikipedia.org/wiki/Beaver_dam beaver dam 850 meters long Wikipedia Wikipedia - Beaver dam en.wikipedia.org/wiki/Beaver_dam Beaver dam Wikipedia matkineet majavia en.wikipedia.org/wiki/Beaver_dam Beaver dams naturally built by beavers naturally built by beavers be huge en.wikipedia.org/wiki/Beaver_dam 850 meters long https://en.wikipedia.org/wiki/Beaver_dam matkineet majavia matkineet majavia beaver dams