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
Nunavut and all of the islands in Hudson Bay, James Bay, and Ungava Bay, including the Belcher Islands, all of which belonged to the Northwest Territories from which Nunavut was separated. This makes it the fifth-largest subnational entity (or administrative division) in the world. If Nunavut were a country, it would rank 15th in area. Nunavut has long land borders with the Northwest Territories on the mainland and a few Arctic islands, and with Manitoba to the south of the Nunavut mainland; it also meets Saskatchewan to the southwest at a quadripoint). Through its small satellite territories in the southeast, it