The Scioto River (pronounced /sa??o?to?/ sigh-OH-toe or /sa??o?t?/ sigh-OH-tuh) is a river in central and southern Ohio more than 231 miles (372 km) in length [3] . It rises in Auglaize County in west central Ohio, flows through Columbus, where it collects its largest tributary, the Olentangy River, and meets the Ohio River at Portsmouth. Too small for modern commercial shipping, its primary economic importance is for recreation and drinking water.