These rocks of the Precambrian are sedimentary and metamorphic deposits supplemented by igneous intrusions forming dikes and sills. Precambrian rocks of the Canadian Shield form the eastern margin of the McTavish Arm. Since, the lake has changed from post-glacial rebound following the ice melting. It was part of glacial Lake McConnell in the pre-glacial valleys reshaped by erosional ice during the Pleistocene. Great Bear Lake lies between two major physiographic regions: the Kazan Uplands portion of the Canadian Shield and the Interior Plains. Rivers flowing into Great Bear Lake include the Whitefish River, Big Spruce River, Haldane River, Bloody River, Sloan River, Dease River and the Johnny Hoe River. The community of Délı̨nę is located on the Keith Arm near the outflow of the Great Bear River that flows west into the Mackenzie River at Tulita. Arms Īrms of Great Bear Lake include the Smith Arm (northwest), the Dease Arm (northeast), the McTavish Arm (southeast), the McVicar Arm (south) and the Keith Arm (southwest). Explorer John Franklin wrote in 1828 that a white rag placed in the water did not disappear until it exceeded a depth of 15 fathoms (90 ft 27 m). The lake is known for its considerable clarity. Great Bear Lake is covered with ice from late November to July. Mackenzie River drainage basin showing Great Bear Lake's position in the Western Canadian Arctic Geography Bathymetric map of Great Bear Lake. Sahoyue (Grizzly Bear Mountain), a peninsula on the south side of the lake, and Edacho (Scented Grass Hills), another peninsula on the west side, form the Saoyú-ʔehdacho National Historic Site of Canada. Grizzly Bear Mountain, or Sahoyue, on the shore of the lake also comes from Chipewyan, meaning "bear-large hill". The Sahtu, a Dene people, are named after the lake. The name originated from the Chipewyan word satudene, meaning "grizzly bear-water people". The lake is in the Northwest Territories, on the Arctic Circle between 65 and 67 degrees of northern latitude and between 118 and 123 degrees western longitude, 156 m (512 ft) above sea level. It is the largest lake entirely in Canada ( Lake Superior and Lake Huron are larger but straddle the Canada–US border), the fourth-largest in North America, and the eighth-largest in the world. Great Bear Lake ( Slave: Sahtú French: Grand lac de l'Ours) is a lake in the boreal forest of Canada. 2,719 km (1,690 mi) (plus 824 km (512 mi) island shoreline) Ģ6 main islands, totalling 759.3 km 2 (293.2 sq mi) in area ġ Shore length is not a well-defined measure.
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