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The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as many of those in the North Cascades , and the notable volcanoes known as the High Cascades .
The Cascades is bordered on the north by the North Cascades ecoregion, on the south by the Klamath Mountains ecoregion, on the east by the Eastern Cascades Slopes and Foothills, and on the west by the Willamette Valley and Puget Lowland ecoregions. It been subdivided into six Level IV ecoregions in Washington and Oregon, as described below ...
The region covers 812 square miles (2,100 km 2) in Washington and 162 square miles (420 km 2) in Oregon, on the eastern slopes of Mount Rainier, Mount Adams, and Mount Hood, and on Black Butte. It contains land belonging to the Yakama Nation and public land within the Wenatchee , Gifford Pinchot , Deschutes , and Mount Hood National Forests ...
The level III ecoregions in Oregon are the Coast Range (1), Willamette Valley (3), Cascades (4), Eastern Cascades Slopes and Foothills (9), Columbia Plateau (10), Blue Mountains (11), Snake River Plain (12), Klamath Mountains (78), and Northern Basin and Range (80). (Compare to map of Level IV ecoregions.)
The Western Cascades or Old Cascades are a sub-province of the Cascade Range in the U.S. state of Oregon, between the Willamette Valley and the High Cascades. [1] The Western Cascades contain many extinct shield volcanoes , cinder cones and lava flows , and the region is highly eroded and heavily forested.
The valley may be loosely defined as the broad plain of the Willamette, bounded on the west by the Oregon Coast Range and on the east by the Cascade Range. It is bounded on the south by the Calapooya Mountains, which separate the headwaters of the Willamette from the Umpqua River valley about 25 miles (40 km) south of Hidden Valley.
Stevens Pass, located in the Cascade Range. The U.S. state of Washington, located in the Pacific Northwest, has several major mountain ranges that are traversed various passes. The state is divided by the Cascade Range, which have the highest passes, and is also home to the Olympic Mountains, Selkirk Mountains, and Blue Mountains.
The Cascades Rapids (sometimes called Cascade Falls or Cascades of the Columbia) were an area of rapids along North America's Columbia River, between the U.S. states of Washington and Oregon. Through a stretch approximately 150 yards (140 m) wide, the river dropped about 40 feet (12 m) in 2 miles (3.2 km). [ 1 ]