The source of the South Branch is located near Hightown in northern Highland County, Virginia. The source of the North Branch is at the Fairfax Stone located at the junction of Grant, Tucker, and Preston counties in West Virginia. Map showing the five geological provinces through which the Potomac River flows The length of the river from the junction of its North and South Branches to Point Lookout is 302 mi (486 km). The Potomac River runs 405 mi (652 km) from Fairfax Stone Historical Monument State Park in West Virginia on the Allegheny Plateau to Point Lookout, Maryland, and drains 14,679 sq mi (38,020 km 2). The South Branch Potomac River lies completely within the state of West Virginia except for its headwaters, which lie in Virginia.Ĭourse The Potomac River in Washington, D.C., with Arlington Memorial Bridge in the foreground and Rosslyn, Arlington, Virginia in the background Except for a small portion of its headwaters in West Virginia, the North Branch Potomac River is considered part of Maryland to the low-water mark on the opposite bank. The river forms part of the borders between Maryland and Washington, D.C., on the left descending bank, and West Virginia and Virginia on the right descending bank. Over 5 million people live within its watershed. It is 405 miles (652 km) long, with a drainage area of 14,700 square miles (38,000 km 2), and is the fourth-largest river along the East Coast of the United States and the 21st-largest in the United States. The Potomac River ( / p ə ˈ t oʊ m ə k/ ⓘ) is a major river in the Mid-Atlantic region of the United States that flows from the Potomac Highlands in West Virginia to the Chesapeake Bay in Maryland. Note: Since 1996, the Potomac has been the 'sister river' of the Ara River of Tokyo, Japan (non-tidal water years: 1931–2018) Ĭonococheague Creek, Antietam Creek, Monocacy River, Rock Creek, Anacostia RiverĬacapon River, Shenandoah River, Goose Creek, Occoquan River, Wicomico River
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