Six Flags Discovery Kingdom is a 135-acre (55 ha) animal theme park located in Vallejo, California, off of Interstate 80 between San Francisco and Sacramento. 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.

An animal theme park, also known as a zoological theme park, is a combination of an amusement park and a zoo, mainly for entertainment, amusement, and commercial purposes. Many animal theme parks combine classic theme park elements, such as themed entertainment and amusement rides, with classic zoo elements such as live animals confined within enclosures for display. Many times, live animals are utilized and featured as part of amusement rides and attractions found at animal theme parks.