In 2154, when Starfleet Commanders Tucker and T'Pol went on a sight-seeing expedition to Vulcan, one of the many sites they visited was the Vulcan Fire Plains. They stood on a cliff overlooking the vista as T'Pol informed Tucker, who was besotted with her, that she was due to marry Koss. (ENT: "Home", "Affliction")
Background information Edit
In the first draft script of "Fusion" (which had the working title "Equilibrium"), scrolls of Surak's original writings had been discovered buried under "the Fire Plains at Riaax." These scrolls had been influential to the V'tosh ka'tur movement, though their authenticity hadn't been officially verified, which made sense to V'tosh ka'tur Szon, as he held the belief that the Vulcan elders viewed the scrolls as a threat.
In the script of "Home", the Fire Plains were described thus; "A vast, boiling field of lava stretches for kilometers in the distance. Enormous rock statues stand on a cliff overlooking the fire plains... they're carved in the image of ancient Vulcan warriors. The statues loom over the scene with power and majesty." In an ultimately omitted line of dialogue from the same script, T'Pol explained, "The statues were built around the time of the Awakening... more than two thousand Earth years [ago]."