Kings Dominion is an amusement park in Doswell, Virginia, United States, twenty miles north of Richmond and 75 miles south of Washington, D.C. Owned and operated by Six Flags, the 280-acre park opened to the public on May 3, 1975, and features more than 60 rides, shows and attractions including 13 roller coasters and a 20-acre water park. Its name is derived from the name of its sister park, Kings Island near Cincinnati, and the nickname for the Commonwealth of Virginia, "Old Dominion."