The South Seas were located on Earth, and had many isolated but inhabited islands. According to Jack Harkness, these islands were home to the Cargo Cults. (PROSE: The Beauty of Our Weapons) Rollo claimed to have once travelled to the South Seas with Captain Cook. (GAME: "The Hunters Home From the Hill" [+]Part of The Iytean Menace, J. Andrew Keith, The Doctor Who Role Playing Game (FASA, 1985).)
Tardis