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The Washita River (Pawnee: ''Awaastatkiicuʾ '' ) is a river in Texas and Oklahoma, United States. The river is long and terminates into Lake Texoma in Johnston County (also Bryan County and Marshall County - ), Oklahoma and the Red River. ==Geography== The Washita River crosses Hemphill County, Texas and enters Oklahoma in Roger Mills County. In Oklahoma it cuts through the Oklahoma Counties of: Roger Mills, Custer, Washita, Caddo, Grady, Garvin, Murray, Carter, and Johnston. Lake Texoma is the border between Bryan County and Marshall County. The river bisects the heart of the Anadarko Basin, according to the USGS the Anadarko Basin is the fifth largest natural gas formation area discovered in the United States. When the river reaches the Arbuckle Mountains it drops 30 ft/mile as it cuts through Big Canyon, a limestone gorge 300 feet deep. The Washita's river bed is made up of unstable mud and sand. The banks of the river are steeply incised and erosive, made up of red earth. This makes it one of the most silt-laden streams in North America. 〔 〕 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「Washita River」の詳細全文を読む スポンサード リンク
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