Mount Tar'Hana

From Memory Alpha, the free Star Trek reference

Mount Tar'Hana was a volcano on the planet Vulcan. In 2154, T'Pol told Commander Trip Tucker that Tar'Hana still occasionally erupted. (ENT: "Home")

Mount Tar'Hana was first mentioned in the Last Unicorn Games role-playing guide The Way of Kolinahr, which features an atlas of the planet Vulcan. It is an example of one of the few non-canon references from a book that became canon.