The Thelon Game Sanctuary (52,000 sq km) straddles the Northwest Territories and Nunavut. The Thelon is home to the most northernly known moose north of the tree line, as well as muskox, barren-ground caribou. Arctic wolf, Arctic , wolverine, and barren ground grizzly bear. The proposal is to expand the Sanctuary east to include encompass the eastern portion of the Thelon River Important Bird Area, which provides breeding habitat for thousands of Canada Geese as well as small numbers of Greater White-fronted Geese and Lesser Snow Geese.

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