Mount Cadon
From Tardis Wiki, the free Doctor Who reference
Mount Cadon was a mountain in southern Gallifrey, tall enough to reach to the transduction barrier. The Prydonian Academy was located at the base of Mount Cadon, (NA: Lucifer Rising) Related buildings, such as the House of Lungbarrow (near the river Cadonflow) were near it (NA: Lungbarrow). In his youth, the Doctor used to climb it while he was young. The Hermit used to tell stories to the young Gallifreyans, like the Doctor, on Mount Cadon. (NA: Lucifer Rising)