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Fixes included the following: Incorporating Big Island and surrounding islands (where Great Slave Lake flows into the Mackenzie River); extending the NWT range all the way to the Alberta border to fill a small gap; and other minor edits that were made in 2012 but had not been fully incorporated into the master file. The revised shapefile was provided to Environment Canada in June 2015. In 2016 the boundary was adjusted to line up with the Alberta/NWT border (A. 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