T'riall is one of three active volcanoes located in the province of Raal on Vulcan, the others being T'raan and T'regar. Their locales were the three points of a triangle, at the base of which was situated the Fire Plains. (Last Unicorn RPG module: The Way of Kolinahr: The Vulcans; Decipher RPG module: Worlds)
- The volcano was misspelled "T'riah" on the map.