Outback

The Outback was a desert region of Australia.

One incarnation of the Doctor lived in the Outback for 123 years, where they "saw some great rocks."

The Great Victoria Desert was found in the Outback. The Thirteenth Doctor visited the desert during a Kasaavin invasion of Earth, where she encountered in the guise of O. (TV: Spyfall)

Behind the scenes
Scenes set in the Australian outback in Spyfall were actually shot on location in South Africa.