Nishnabotna River

The Nishnabotna River (/nɪʃnəˈbɑːtnə/) is a tributary of the Missouri River in southwestern Iowa, northwestern Missouri and southeastern Nebraska in the United States. It flows for most of its length as two parallel streams in Iowa, the East Nishnabotna River and the West Nishnabotna River. The east and west branches are each about 120 miles (190 km) long; from their confluence the Nishnabotna flows approximately another 16 miles (26 km). Several sections of the rivers' courses have been straightened and heavily channelized.

The river is the third largest stream in Iowa on the Missouri slope, after the Big Sioux River and Little Sioux River. It has the second largest watershed in Iowa, since only a small portion of the Big Sioux drains in Iowa. The mouth of the Nishabotna was formerly 20 miles further south in Atchison County, Missouri, but changes in the Missouri River have cut off the lower portion and reduced the length of the river.

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