The mountains are made of Paleozoic rocks and rise to heights between 1,067 m (3,501 ft) and 1,433 m (4,701 ft) and are separated by valleys through which flow the major rivers fed by the ice fields and glaciers.

To the est, the mountain range extends across the Hazen Plateau while, to the west, it runs virtually to the head of Tanquary Fiord.

The mountains, which tower as much as 1,500 m (4,921 ft) above Lake Hazen, typically consists of steep snow-free slopes facing south, with north-facing slopes of shallow gradients covered in snow and ice.

At intervals, the range is bisected by broad valleys 5 to 8 km (3.1 to 5.0 mi) in width that are occasionally filled by glacial tongues, such as the monumental Henrieta Nesmith Glacier that descends to within 4 km (2 mi) of Lake Hazen near its northwestern end.

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