Which river rises in the mountains of West Virginia and flows eastward along the Virginia-Maryland border into Chesapeake Bay?

The river that begins its journey in the mountains of West Virginia and flows eastward, forming a significant portion of the border between Virginia and Maryland before emptying into the Chesapeake Bay, is the Potomac River. Its headwaters, specifically the North Branch, originate at the Fairfax Stone in West Virginia. The river then travels approximately 405 miles, winding through a diverse landscape, and is notably recognized for flowing directly through Washington, D.C.

The Potomac holds immense historical and cultural significance, often referred to as "the Nation's River." George Washington, the first President of the United States, spent much of his life within its watershed, and his home, Mount Vernon, sits on its banks. During the American Civil War, the Potomac served as a crucial boundary between the Union and the Confederacy, and the Union's largest army was named after it. The river has also played a vital role in transportation and trade throughout history, with canals like the Chesapeake and Ohio Canal built alongside it.

Beyond its historical importance, the Potomac River is an essential natural resource today, providing drinking water for over 5 million people, including the residents of Washington, D.C. Its watershed, which spans parts of West Virginia, Maryland, Virginia, Pennsylvania, and the District of Columbia, is home to diverse ecosystems and offers numerous recreational opportunities such as fishing, kayaking, and hiking. Efforts over the past decades have focused on improving its water quality, making it a cleaner and healthier environment for both wildlife and the millions who live within its basin.