Norfolk, Virginia is situated at the mouth of the James, Elizabeth, and Nansemond rivers near the outlet of Chesapeake Bay on the Atlantic Ocean. With the cities of Hampton, Portsmouth, and Newport News, Norfolk forms the port of Hampton Roads - one of the greatest natural harbours in the world. Norfolk is a major national seaport and an important military centre, having the world's largest shipbuilding and repair centre, the U.S. Navy's Atlantic Fleet, US Marine, Coast Guard, and NATO facilities, an Armed Forces Staff College and Langley Air Force Base with its astronaut training centre. Norfolk is the site of the Chrysler Museum and the Mariners Museum, which features America's most extensive international collection of mariner's artifacts -- paintings, maps, scrimshaw, ship models, and unique watercraft. Nearby you can visit Colonial Williamsburg.