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The Smoky Hills are an upland region of hills in the central Great Plains of North America. They are located in the central United States, encompassing north-central Kansas and a small portion of south-central Nebraska. The hills are a dissected plain covered by tallgrass and mixed-grass prairie. The Smoky Hills were formed by sedimentary deposits during the Cretaceous period and consist of chalk, limestone, and sandstone rock outcroppings. ==Geography== The Smoky Hills region is part of the Plains Border subregion of the Great Plains. It occupies nearly all of north-central Kansas, bordered on the west by the High Plains, on the northeast by the Dissected Till Plains, on the east by the Flint Hills, and on the south by the Arkansas River lowlands. The region extends into south-central Nebraska, bordered on the north by the Rainwater Basin. It consists of three belts of hills, all running southwest to northeast, which correspond to the underlying geological formations (see Geology). The Smoky Hills proper comprise the easternmost belt; the two western belts are known as the Blue Hills. The hills of the westernmost belt are also known as the Chalk Bluffs. The Blue Hills escarpment forms the boundary with the High Plains to the west. The Environmental Protection Agency divides the region into two ecoregions, the Smoky Hills proper constituting one in the east and the Blue Hills and Chalk Bluffs constituting the other, the Rolling Plains and Breaks ecoregion, in the west.〔 The Republican, Saline, Solomon, and Smoky Hill Rivers flow eastward through the Smoky Hills from their sources in the High Plains. Beginning in the 1940s, the U.S. Army Corps of Engineers and the U.S. Bureau of Reclamation dammed these rivers at points in the Smoky Hills for flood control and irrigation purposes, creating several reservoirs.〔(【引用サイトリンク】 publisher = U.S. Army Corps of Engineers )〕〔(【引用サイトリンク】 publisher = U.S. Bureau of Reclamation )〕 These include Cedar Bluff Reservoir, Kanopolis Lake, Kirwin Reservoir, Waconda Lake, Webster Reservoir, and Wilson Lake. Land use in the Smoky Hills consists primarily of cropland and rangeland.〔 The region is sparsely populated with numerous communities of varying size, but no large cities. The two largest communities in the Smoky Hills region are Salina, Kansas and Hays, Kansas. Elevations in the Smoky Hills range from about in the river valley near Salina to about at the western edge of the region.〔Topo USA, DeLorme, 6.0〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Smoky Hills」の詳細全文を読む スポンサード リンク
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