53.9042N -120.067W
Located on the Continental Divide in the upper Buchanan Creek Valley, 4.5 km southwest of Cecilia Lake

Province: BC
Headwater: Fraser

Year Named: 1923
Named by: Interprovincial Boundary Survey
Named for: The name refers to the impregnable aspect of the feature; an extremely steep shale slope or wall extends almost 3 miles from this feature to Bastille Mountain - "a great wall of rock shaped like a cantilever span."