Six Flags Discovery Kingdom (formerly known as Six Flags Marine World, Marine World, The New Marine World Theme Park, and Marine World Africa USA) is a 135-acre (55 ha) animal theme park located in Vallejo, California, roughly halfway between San Francisco and Sacramento on Interstate 80. The park includes a variety of roller coasters and other amusement rides. Six Flags Discovery Kingdom has been part of the Six Flags chain of amusement parks since 1999. Daily Public Transportation to the park is provided by Amtrak Thruway's 7 Route to Martinez station, Evans Transportation also provides daily service between a Courtyard by Marriott hotel adjacent to the northeastern border of the park and Oakland International Airport. Vallejo's local public transit provider SolTrans serves the park Monday through Saturday, connecting the park with Fairfield Transportation Center, Vallejo Station, and other points in Southern Solano County.