The Scioto River ( sy-OH-tə or sy-OH-toh) is a river in central and southern Ohio more than 231 miles (372 km) in length. It rises in Auglaize County in west central Ohio, flows through Columbus, Ohio, where it collects its largest tributary, the Olentangy River, and meets the Ohio River at Portsmouth. Early settlers and Native Americans used the river for shipping but it is now too small for modern commercial shipping. The primary economic importance for the river now is for recreation and drinking water. It is the longest river that is entirely within Ohio. Source: Wikipedia