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National Harbor Marina in Washington D.C./Maryland is perfectly positioned in the Upper Potomac River just south of the Washington D.C. border on the Maryland coastline. This marina in Maryland is surrounded by a plethora of shopping, dining, and activity! Gaylord National Resort Convention Centre and the nearby MGM National Harbor Resort and Casino provides an unforgettable night out on the town just a few steps from your slip. As one of the best marinas in Washington DC, National Harbor Marina caters specifically to cruisers and megayachts. With easy access off the Chesapeake Bay offering an amazing location with beautiful views of the Potomac River, National Harbor Marina allows boaters to have a vacation while they're cruising around looking for a marina near Washington DC.