Rocky Mountain Trench

ROCKY MOUNTAIN TRENCH is a 1,400-km-long valley, the longest in N America, trending northwest–southeast almost completely through BC from Montana to the Liard Plain just south of the BC–Yukon border. A geological fault zone separating different earth plates, it divides the ROCKY MTS on the east from a series of high mountain ranges and plateaus on the west (from south to north): the COLUMBIA, Omineca and Cassiar mountains. It varies in width from 3 to 16 km. Before the construction of...

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