Rocky mountain trench
The Rocky Mountain Trench is widely known as a chain of interconnected linear valleys along the western side of the Rocky Mountains from Montana to near the British Columbia—Yukon boundary, a distance of about 1,600 km ( Fig. 1). The valleys are characteristically steep sided, with relief of 1,000–2,000 m. A distinct, flat floor, 3–13 km wide, is common ( Figs. 2 and 3), but some long sections are narrow and V-shaped. The valley floors have gentle longitudinal gradients with low, inconspicuous divides ( Fig. 4).
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