Karachi

Karachi was a city located in India in 1930. (AUDIO: Storm Warning) By the time Tarak Ital grew up there in the 21st century, it had become a part of Pakistan. (TV: The Waters of Mars)

The pilot Amy Johnson stopped off in Karachi on her attempt to set the speed record from England to Australia. (COMIC: A Wing and a Prayer)

In 1930, the R101 left London, supposedly bound for Karachi. Aboard were two stowaways: the Eighth Doctor and Charlotte Pollard. (AUDIO: Storm Warning)

Behind the scenes
In 1930, when A Wing and a Prayer and Storm Warning are set, the real life country of Pakistan had not yet been created. At that point in the real world, all of modern day India, and Pakistan were a part of the, or India for short. In The Waters of Mars, a fictional on screen news article about Tarak Ital describes Tarak as having grown up in "Karachi, Pakistan" after he was born in 2026.