The Llangon Mountains are a mountain range on Vulcan, situated on the edge of Vulcan's Forge. In 2237, Spock was cornered by a le-matya in the foothills of the Llangon Mountains during his attempt at the kahs-wan. (TAS episode: "Yesteryear") The Institute for the Transmission of Vulcan Culture is located near the base of the Llangon Mountains. It is also where Doctor Tully of the Federation Archaeology Council attempted to find the legendary lost city of ShiGral in 2293. (TOS short story: "The First Law of Metaphysics")