Mongolia

Mongolia was a country in Asia, located north of China. The Gobi Desert covered parts of both Mongolia and China. (DW: Marco Polo)

In the Cretaceous period, Mongolia was populated by dinosaurs, such as tsintaosaurus,dsungaripterus, protoceratops, velociraptor, ankylosaurs, tyrannosaurs, bactrosaurs, and Alioramus. The Doctor arrived in Mongolia during the Cretaceous period to pick up Ace, whom he had dropped off there. Along the way he encountered a pit of dholes and an alien slave who had escaped from a nearby construction site. Ace arrived with a herd of various dinosaurs to trample the site, destroying it and freeing the slaves. (DWM: Living in the Past)

A Raxacoricofallapatorian arm, believed by Rose Tyler to belong to a Slitheen, was found in Mongolia in 1952, it later ended up in the Vault. (DW: Dalek) (VG: The Last Dalek)