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The South Fork Republican River is a river that arises in Lincoln County, Colorado, United States, and flows east-northeastward for about 243 kilometers (151 mi) through Kit Carson and Yuma Counties, Colorado, and Cheyenne County, Kansas, to the confluence with the North Fork Republican River in Dundy County, Nebraska, where they form the Republican River. Bonny Reservoir is located on the South Fork Republican River in Yuma County, Colorado. Bonny Lake State Park is located at the reservoir.