Brecon Beacons
From Tardis Wiki, the free Doctor Who reference
The Brecon Beacons were a mountainous area in South Wales.
Gabriel Sneed assumed that the Gelth were from Brecon when the Ninth Doctor said they came from "up there". (TV: The Unquiet Dead)
The village of Brynblaidd was in Brecon. (TV: Countrycide)
Rhys Williams implied that he might escape by car to Brecon Beacons if his wife Gwen Cooper phoned him about a true emergency. (AUDIO: Herald of the Dawn)
Behind the scenes
Scenes set in Scotland, in TV: The Eaters of Light, were filmed in the Brecon Beacons.