Tholia (also known as Tholis) was the homeworld of the Tholians, and the seat of the Tholian Assembly.
The planet suffered from a number of quakes from the volcanic Underrock beneath the world's three principal continents. (VAN novel: Harbinger) Tholia possessed three continents. In 2298, the planet was catalogued as a class N planet. (TLE novel: The Sundered)
In 2151, Klaang shouted out the planet's name while he was aboard the Enterprise (NX-01). (ENT episode: "Broken Bow")
Tholian silk was often sent from Tholis to Ferenginar. (DS9 novel: Legends of the Ferengi)