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Niobrara River : ウィキペディア英語版 | Niobrara River
The Niobrara River (; from the Ponca Ní Ubthátha khe pronounced , meaning "water spread-out horizontal-the") is a tributary of the Missouri River, approximately long,〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed March 30, 2011〕 running through the U.S. states of Wyoming and Nebraska.〔("Nature & Science". ) (National Park Service: Niobrara National Scenic River. ) Retrieved 2011-03-10.〕 The river drains one of the most arid sections of the Great Plains, and has a low flow for a river of its length. The Niobrara's watershed includes a small south-central section of South Dakota as well as the northern tier of Nebraska and a tiny area of eastern Wyoming. ==Course== The river rises in the High Plains of Wyoming, in southern Niobrara County. The Niobrara flows east as an intermittent stream past Lusk and southeast into northwestern Nebraska. It then flows southeast across the Pine Ridge country of Sioux County, then east through Agate Fossil Beds National Monument, past Marsland, and through Box Butte Reservoir. The stream flows east across northern Nebraska, near the northern edge of the Sandhills and past Valentine. It is joined by the Snake River about southwest of Valentine. In north-central Nebraska it is joined by the Keya Paha River approximately west of Butte. The river joins the Missouri northwest of Niobrara in northern Knox County. Its total drainage basin is about .
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