Maryland’s riverine system is a complex network of branches and tributaries, many of which are tributaries to the Chesapeake Bay. The three largest rivers are the Potomac, Patapsco, and Patuxent. The Potomac River runs east for most of its length before turning south and creates a natural border between Maryland and Virginia. The river is the fourth largest along the Atlantic Coast and has many creeks and streams that flow into it. The Potomac offers many recreational opportunities around the Washington DC area and has multiple access points within the capital region. The Patapsco runs southwest, past Baltimore, and into the Chesapeake Bay. Located between the Patapsco and the Potomac, the Patuxent River covers over 957 square miles, and bears the distinction of being the longest river exclusive to Maryland.

Maryland’s rivers have been integral to the development of the state since its inception. In the years before European expansion, native peoples used rivers, such as the Susquehanna and the Pocomoke, for food and transportation. Early European explorers traversed rivers from the Chesapeake Bay inland, establishing contact with Native Americans, setting up trading posts, and later settlements. Later, the rivers transported the commerce of the Industrial Revolution.

Maryland has approximately 16,839 miles of river, but no designated wild and scenic rivers.