Athabaska

Lake, a lake in W Canada, in NW Saskatchewan and NE Alberta. About 200 miles (320 km) long; about 3000 sq. mi. (7800 sq. km).
a river in SW Alberta, Canada, flowing NE to Lake Athabasca; oil-bearing tar sands. 765 miles (1231 km) long.
Historical Examples

Three years later moved to the athabaska department, and remained there until 1809, when he took charge of New Caledonia.
The Makers of Canada: Index and Dictionary of Canadian History Various

From the Rio Grande to the athabaska, for the greater part, the frontier sky was blue and cloudless during most of the year.
The Passing of the Frontier Emerson Hough

The summit of the pass is eighteen miles in a straight line from the athabaska River.
The Makers of Canada: Index and Dictionary of Canadian History Various

The following morning the guide and his helper with the outfit were waiting for us on the other side of the athabaska.
Among the Canadian Alps Lawrence J. Burpee

Kane crossed the athabaska Pass in 1846, and returned the same way the following year.
Among the Canadian Alps Lawrence J. Burpee

The pass was used thereafter by the traders as a route from the athabaska to the Columbia.
The Makers of Canada: Index and Dictionary of Canadian History Various

noun
Lake Athabaska, a lake in W Canada, in NW Saskatchewan and NE Alberta. Area: about 7770 sq km (3000 sq miles)
a river in W Canada, rising in the Rocky Mountains and flowing northeast to Lake Athabaska. Length: 1230 km (765 miles)