Mountain

A mountain was a land feature which was significantly higher than its surroundings.

On Gallifrey, the Doctor grew up in the House of Lungbarrow on Mount Lung, (PROSE: Lungbarrow) while the Master's father owned land on the slopes of Mount Perdition. (TV: The End of Time)

Olympus Mons was a large volcanic mountain on Mars. According to Tanya Webster, it was "the biggest volcano in known creation" and was located "just across the plain" from Izdaal's tomb. (AUDIO: Red Dawn) Rudy Zoom claimed he was the first man to climb it. (COMIC: The Eye of Torment) The central control facility for the Sol Transit System was located inside Olympus Mons, as well as the power grid established by Fusion Corp. (PROSE: Transit)

The Earth mountain Mount Everest was first successfully climbed by humans in 1953. (TV: The Idiot's Lantern) Santiago Jones visited it during one of his journeys. (TV: Death of the Doctor)

"The company" blasted mountains to find minerals on Kromon. (AUDIO: The Creed of the Kromon)

The mountains on Judoonia were 1,000 miles high. (AUDIO: Judoon in Chains)