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
Melville Island (Northwest Territories and Nunavut) deposits. The island was believed to have deposits of coal and oil shale since the first half of the 20th century. The first Canadian Arctic island exploratory well was spudded in 1961 at Winter Harbour. It drilled Lower Paleozoic strata to a total depth of . In the 1970s, the northern portion of the island on the east side of the Sabine Peninsula proved to contain a major gas field, known as Drake Point. The lease was owned by Panarctic Oils, a joint operation with the Canadian Government. Melville Island (Northwest Territories and Nunavut) Melville Island is an uninhabited island