1) Ouachita river 2) River 
[n] - a river that rises in western Arkansas and flows southeast into eastern Louisiana to become a tributary of the Red River
Ouachita River noun a river that rises in western Arkansas and flows southeast into eastern Louisiana to become a tributary of the Red River
a river flowing SE from W Arkansas through NE Louisiana to the Red River. 605 mi. (975 km) long. · a member of a former North American Indian tribe, apparently of the Caddoan stock, of NE Louisiana.