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The Arkansas River (Pawnee: ''Kícka'' 〔(【引用サイトリンク】 work = American Indian Studies Research Institute )〕) is a major tributary of the Mississippi River. The Arkansas generally flows to the east and southeast as it traverses the US states of Colorado, Kansas, Oklahoma, and Arkansas. The river's source basin lies in the western United States in Colorado, specifically the Arkansas River Valley, where the headwaters derive from the snowpack in the Sawatch and Mosquito mountain ranges. Then it flows east into the Midwest via Kansas, and finally into the South through Oklahoma and Arkansas. At 1,469 miles (2,364 km), it is the sixth-longest river in the United States, the second-longest tributary in the Mississippi–Missouri system, and the 45th longest river in the world. Its origin is in the Rocky Mountains in Lake County, Colorado, near Leadville. In 1859, placer gold discovered in the Leadville area brought thousands seeking to strike it rich, but the easily recovered placer gold was quickly exhausted. The Arkansas River's mouth is at Napoleon, Arkansas, and its drainage basin covers nearly 170,000 sq mi (440,300 km²).〔See watershed maps: (1 )〕 In terms of volume, the river is much smaller than both the Missouri and Ohio Rivers, with a mean discharge of roughly . The Arkansas from its headwaters to the 100th meridian west formed part of the US-Mexico border from the Adams–Onís Treaty (in force 1821) until the Texas Annexation or Treaty of Guadalupe Hidalgo. ==Pronunciations== Name pronunciation varies by region. Many people in western states, including Kansas and Colorado, pronounce it ,〔(Random House Dictionary )〕 while many other people in Colorado and Arkansas typically pronounce it according to a state law passed in 1881. 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「Arkansas River」の詳細全文を読む スポンサード リンク
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