The Purcell Trench, also known as the Kootenay River Valley is a large valley on the western side of the northern part of North America's Rocky Mountains. The trench extends approximately 179 miles (288 km) from Lake Pend Oreille, Idaho, down the Kootenay River (north) to Kootenay Lake, up the north arm to Duncan Lake. It joins the Rocky Mountain Trench another 50 miles (80 km) northward at the south tip of Kinbasket Lake, in British Columbia. The trench bottom is 1 to 7 miles (1.6 to 11.3 km) wide and is 1,750 to 2,100 feet (530 to 640 m) above sea level. The trench is nearly a straight north or south line. Some of its topography has been carved into U-shaped glacial valleys, it is primarily a product of geologic faulting. The trench splits the Columbia Mountains between the Purcell Mount
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