Big Sandy River (Ohio River)
 The Big Sandy River is a tributary of the Ohio River approximately 29 miles (47 km) long in western West Virginia and northeastern Kentucky in the United States. The river forms part of the boundary between the two states along its entire course. Via the Ohio River it is part of the Mississippi River watershed.It is formed between Louisa Kentucky and Fort Gay West Virginia by the confluence of the Tug Fork and Levisa Fork.