river flowing from NE N.Mex. eastward to the Arkansas River, near Tulsa, Okla.: c. 600 mi (966 km)
Origin:
AmSp cimarrón, wild, unruly (< OSp cimarra, thicket): prob. orig. referring to the wild sheep (bighorn) found along its banks
See Cimarron in American Heritage Dictionary 4
A river rising in northeast New Mexico and flowing about 1,123 km (698 mi) eastward across southwest Kansas to the Arkansas River in northern Oklahoma.