Fire Plains

From Memory Alpha, the free Star Trek reference

The Fire Plains are a lava field formation on Vulcan consisting of fiery pits and several large statues.

In Falor's Journey, when T'Para offered Falor truth, he crossed the barren Fire Plains to get to the silent monks of Kir. (VOY: "Innocence")

There is a proto-Vulcan drama called Clash on the Fire Plains. Neelix was going to read this to Tuvok, performing all twenty-three parts himself, in hopes it would help him recover. (VOY: "Riddles")

In 2154, when Commander Tucker and T'Pol visited Vulcan, one of the many sites they visited was the Vulcan Fire Plains. (ENT: "Home", "Affliction")