Ecoinformatics writes The Longest Beaver Dam in the World "The longest beaver dam found with Google Earth to date (October 2 2007) is located in Northern Alberta. The dam has a length of about 850 meters (2790 ft). It has at least existed at this spot for over 15 years as it can be observed on the 1990 LandSat 7 Pseudo Color Imagery Provided by NASA World Wind. However 1975 aerial photo's show that this dam did not exist in 1975."
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