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Memory Alpha

Tholia was an inhabited planet in the Tholia system. This homeworld of the Tholians was located inside Tholian space in the Alpha Quadrant. The planet was the capital planet of the Tholian Assembly and, later, the Tholian Republic. (SNW: "Children of the Comet")

In 2151, "Tholia" was one of four proper nouns stated by the Klingon courier Klaang while being transported to Qo'noS aboard Enterprise NX-01. Ensign Hoshi Sato, Enterprise's communications officer, was unable to translate the word. (ENT: "Broken Bow")

In 2293, the location of this planet was labeled in a star chart found on the navigation console of the USS Enterprise-B. (Star Trek Generations)

In early 24th century, the location of Tholia was labeled on a Section 31 star chart used in a briefing presented by Control to Alpha Team. (Star Trek: Section 31)

According to Star Trek: Star Charts (p. 35), Stellar Cartography: The Starfleet Reference Library ("Stellar Cartography", p. 10), and The Worlds of the Federation (p. 150), Tholia was the home planet of the Tholian species. A class Y planet with a searing hot methane environment, it was the second planet in the Tholian system. In general, an association of "Tholia" with the Tholians is sensible, as they are later revealed to be a faction (if a rather obscure one) of the Temporal Cold War – the very conflict that ended Klaang on Enterprise in the first place.

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