Mount Cadon was a mountain in southern Gallifrey, tall enough to reach to the transduction barrier. The Prydonian Academy was located some distance up Mount Cadon. (NA: Timewyrm: Revelation, 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)