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Geography of the North Cascades : ウィキペディア英語版 | Geography of the North Cascades (詳細はBritish Columbia, Canada and Washington, United States. In Canada, the range is officially named the Cascade Mountains but is commonly referred to as the Canadian Cascades. ==Extent== The Fraser River and Similkameen River in British Columbia form the northern boundary of the North Cascades. On the east, the Okanogan River and the Columbia River bound the range. On the west within the United States, the foothills of the range are separated by a narrow coastal plain from Puget Sound, whereas in Canada there are few if any foothills and the range drops steeply to the floodplain of the Fraser Lowland. The southern boundary of the North Cascades is less definite. For the purposes of this article, it will be taken as US Highway 2, running over Stevens Pass, or equivalently, the Skykomish River, Nason Creek, and the lower Wenatchee River. This roughly follows Beckey's division. Sometimes the southern boundary is defined by Snoqualmie Pass and the approximate route of Interstate 90.〔(【引用サイトリンク】title=Level III and Level IV Ecoregions of the Northwestern United States )〕
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