Kings Dominion is a theme park in Doswell, Virginia. It is 20 miles (30 km) north of Richmond and 75 miles (120 km) south of Washington, D.C., off Interstate 95. The 400-acre (1.6 km2) park opened on May 3, 1975. It is owned by Cedar Fair. Kings Dominion offers over 60 rides, shows and attractions including 21 roller coasters and 63-acre (250,000 m2) water park. The name of the park comes from the name of its sister park, Kings Island, and the nickname for the state of Virginia, "Old Dominion".