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| | Rocky Mountains. The Columbia Gazetteer of North America. 2000 |
 | | Two especially distinctive trenches are the Rocky Mt. Trench, which extends NW from Flathead L., and the Purcell Trench, which extends N from Coeur dAlene L. The Okanagan Highlands, in NE Wash., form the W edge of the Northern Rockies. |
 | | The prominent, wide-floored Rocky Mt. Trench, W of the crest line, continues c.800 mi/1,290 km into Canada from Mont. and is drained by the headwaters of the Peace R. and by sections of the Fraser, Columbia, and Kootenay rivers. |
 | | The Rockies are a year-round recreational attraction and have seen a boon in vacation-housing constructionespecially in Colo., which is most convenient to cross-country travel routesand, thus, pop. |
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