Kafiristan

Kafiristan was a Middle Easter country near the Soviet Union.

In 1989, Sayf Udeen was the prince of the country. The Seventh Doctor, Raine Creevy and Ace defeated the Metatraxi there. (AUDIO: Crime of the Century)

Behind the scenes
("land of the infidels") was a real historical region that became known as ("land of illumination") in 1895 and is now part of Afghanistan.