Western Brook glacial trough, Newfoundland, Canada. The sheer walls of this glacial trough soar up to 700 m high, and the glacial basin is 500 m deep in places.
—Source: Natural Resources Canada. Unattributed photograph. Copyright Terrain Sciences Division, Geological Survey of Canada.

Aerial view of Western Brook glacial trough, Newfoundland, Canada. In preglacial time, this gorge was a normal river valley near sea level. As the plateau was altered during the Ice Age, powerful outlet glaciers deepened and widen the valley.
–Source: Natural Resources Canada. Unattributed photograph. Copyright Terrain Sciences Division, Geological Survey of Canada.