Which river forms part of the natural border between Maryland and Virginia in the east and part of the border between West Virginia and Virginia in the west?

The Potomac River runs across the Mid-Atlantic region, from the Potomac Highlands to the Chesapeake Bay. The river is roughly 405 miles long, making it the fourth-biggest river on the East Coast. Our nation's capital of Washington, D.C. sits right on a portion of the Potomac River.

Asked by Vasilii Kulev · Last updated 4 years ago · 513.8K views · SOURCE