Vietnam
From Tardis Wiki, the free Doctor Who reference
Vietnam was a country in Asia.
History
The Fifth Doctor, Nyssa, Wilton, Mulberry and Floyd visited Vietnam and met Major Alice Hunniford. (AUDIO: Renaissance of the Daleks)
On 24 December 1969, the Third Doctor and Sarah Jane Smith visited Saigon, Vietnam during the Christmas ceasefire. (PROSE: Interesting Times)
In 1979, China invaded Vietnam. (TV: Tooth and Claw)
The Chinese three-striped box turtle was found in Vietnam. (PROSE: The Last Dodo)