The Land Unknown is a 1957 science fiction CinemaScope adventure film about a naval expedition trapped in an Antarctic jungle. The story was allegedly inspired by the discovery of unusually warm water in Antarctica in 1947. It stars Jock Mahoney and Shirley Patterson and was directed by Virgil W. Vogel. The film's low-budget special effects include men in dinosaur suits, puppets and monitor lizards standing in for dinosaurs.