Glen

From Tardis Wiki, the free Doctor Who reference

A glen was a kind of valley found in Scotland. One such glen was the Glen of St Catherine, in which a monastery was located. Some time in the 1540s, a Lupine Wavelength Haemovariform crashed in the valley. (TV: Tooth and Claw)

The Great Glen in the Scottish Highlands was home to Loch Ness. (PROSE: The Secret Lives of Monsters)

The Glen of Sleeping was a glen rumoured to exist in Scotland. Professor Barnes was leading an archaeological expedition to find the glen when he encountered the Third Doctor. (COMIC: The Glen of Sleeping)