Big Sandy
The Big Sandy is formed by the union of the Tug and Levisa Forks at Lousia, Kentucky, from which point it flows in a northerly direction to the Ohio River at Catlettsburg, Kentucky. Throughout its length the Big Sandy form the boundary line between Kentucky and West Virginia.

Both the Tug and Levisa Forks have their sources on the western slopes of the Appalachian Mountains in the extreme western end of Virginia. Tug Fork, from its sources flows in a northwesterly direction to its mount at Louisa. For a short distance below the boundary line of McDowell County it froms the boundary line between Virginia and West Virginia; for the remainder of its length it forms the boundary between Kentucky and West Virginia. levisa Fork, from its sources flows in a northwesterly direction to Paintsville, Kentucky, where it turns northeasterly and joins the Tug Fork at Louisa.

Some of the featured rivers and streams of the Big Sandy Watershed are:
- Tug Fork River