Northwest Territories April 1, 1999, when the territory was subdivided to create Nunavut to the east, via the "Nunavut Act" and the "Nunavut Land Claims Agreement". While Nunavut is mostly Arctic tundra, the Northwest Territories has a slightly warmer climate and is both boreal forest (taiga), and tundra, and its most northern regions form part of the Canadian Arctic Archipelago. The Northwest Territories is bordered by Canada's two other territories, Nunavut to the east and Yukon to the west, and by the provinces of British Columbia, Alberta, and Saskatchewan to the south. The name is descriptive, adopted by the British government during
British Arctic Territories the Province of Manitoba and the new Northwest Territories, which originally included northern Ontario, the rest of Manitoba, all of Saskatchewan and part of Alberta, and what is now Nunavut territory, with the name Northwest Territories retained by the successor government in the region flanked by the Mackenzie River drainage to the north of Alberta. The North-Western Territory was to its northwest, and included parts of British Columbia north of the Stikine Territory and including all of today's Yukon territory, and parts of Alberta not in the Hudson Bay drainage, as well as today's Northwest Territories. Flags of the World