Athabasca, Lake

Lake in Canada, astride the Alberta - Saskatchewan border, just south of the Northwest Territories. The lake, 208 mi (335 km) long by 32 mi wide, has an area of 3,064 sq mi (7,936 sq km) and a maximum depth of 407 ft (124 m). Fed from the southwest by the Peace and Athabasca rivers (the deltas of which have separated it from Lakes Claire and Mamawi), it is drained to the northwest by the Slave River, eventually reaching