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Hells Canyon Wilderness (Oregon and Idaho)
The Hells Canyon Wilderness is a wilderness area in the western United States, in Idaho and Oregon. Created in 1975, the Wilderness is managed by both the U.S. Bureau of Land Management and the U.S. Forest Service and contains some of the most spectacular sections of the Snake River as it winds its way through Hells Canyon, North America's deepest river gorge〔(【引用サイトリンク】publisher = U.S. Forest Service )〕 and one of the deepest gorges on Earth. The Oregon Wilderness Act of 1984 added additional acreage and currently the area protects a total area of .〔(【引用サイトリンク】publisher=Wilderness.net )〕 It lies entirely within the Hells Canyon National Recreation Area except for a small plot in southeastern Wallowa County, Oregon which is administered by the Bureau of Land Management. The area that is administered by the Forest Service consists of portions of (in descending order of acreage) the Wallowa, Nez Perce, Payette, and Whitman National Forests.〔(【引用サイトリンク】publisher=Wilderness.net )〕
==Topography==
The Oregon portion of Hells Canyon Wilderness is characterized by two steep breakland areas in excess of 60 percent paralleling the Snake River. These are separated by a benchland at mid-elevation between the river and canyon rim between Saddle Creek and Dug Bar. The dominant vegetation is native bunchgrasses and shrubs. Trees are scattered throughout the Oregon side of the Wilderness, but concentrated on north-facing slopes and in stream bottoms - primarily ponderosa pine and Douglas fir. The three topographic provinces are dissected by many drainages including Saddle, Temperance, Salt, and Sluice Creeks.
The Idaho portion of Hells Canyon Wilderness is characterized by three geologic-vegetative regions. The upper areas are alpine and subalpine with several lakes and geologic formations of glacial origin. Vegetation is sparse and broken by large areas of rock. The middle portions contain dense forests of larch, lodgepole pine, and true firs. Lower elevations are characterized by dry, rocky, barren, steep slopes breaking into the Snake River and its major tributaries. Trees are sparse, consisting mostly of ponderosa pine and Douglas fir. This entire area is dissected by several major drainages including Sheep Creek, Granite Creek, and Deep Creek.〔 The highest peaks are the Seven Devils Mountains, the tallest is "He Devil" at above sea level.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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