The Potomac river
The Ohio River forms Ohio's southern border.
The southern half of the eastern boundary of Alabama is the Chattahoochee River.
The Potomac River divides Maryland and Virginia (The Southern Border) , but Virginia does not own half of the Potomac River.
The Ohio River is the southern boundary of Ohio and Indiana.
The Ohio river is located on the southern boundary of Indiana and Ohio. The Ohio River also borders northern Kentucky.
Ohio River
The Mississippi river forms the boundary between Missouri and Illinois!
The Ohio River forms the boundary between Indiana and Kentucky.
The Clare river is a river running in the counties of Mayo and Galway. The main river in county Clare is the river Fergus. However, the river Shannon, the longest river in Ireland form the eastern boundary of county Clare and its estuary forms the southern boundary,
Ohio river
The Ohio River forms the southern state line,and Lake Erie is on the northern boundary.
The Ohio River is south of Indiana and forms the boundary between Indiana and Kentucky.