Wales

The capital and largest city of Wales is Cardiff.

Appearances in Doctor Who

The Green Death: The Third Doctor and Jo Grant visit a mining area in Wales.
The Unquiet Dead: The Ninth Doctor and Rose Tyler encounter both Charles Dickens and a time rift in 1879 on Christmas Day in Cardiff.
Boom Town: The TARDIS lands in Cardiff in September 2006 to use the wound of the time rift to refuel. After the Ninth Doctor, Rose and Jack meet up with Mickey, the group discover that Margaret Blaine has survived the destruction of 10 Downing Street in World War Three and is now Lord Mayor of Cardiff. After the group catch her outside City Hall, Margaret admits to the Doctor that she plans to demolish Cardiff Castle and build the Blaidd Drwg (English: Bad Wolf) nuclear power station. Using a combination of a nuclear explosion and the time rift, she would use a tribophysical waveform macrokinetic extrapolator as a pan-dimensional surfboard to escape the solar system after Earth's destruction.
Utopia: Seen briefly when refuelling the Tardis.