Athabasca

Athabasca, a river and lake in British North America. The former, also known as Elk river, rises in the Rocky Mountains near Mount Brown, flows north-west, then north, and discharges itself into the south extremity of the lake. The latter has a length of about 230 miles, and an average breadth of 20 miles. It communicates with the Polar Sea through Great Slave Lake, and with Hudson's Bay at Port Nelson, and receives the Peace river from the west.