Alpha and Beta Quadrant star chart which depicts the Tholian Assembly's location.
The Tholian Assembly is the government of a race of crystalline beings that inhabit a region of space bordering the Federation and the Klingon Empire, known as Tholians. (TOS:"The Tholian Web")
In 2152, the Assembly was a faction fighting in the Temporal Cold War. (ENT: "Future Tense")
In 2373, the Tholian Assembly signed a nonaggression pact with the Dominion, and remained neutral during the war. (DS9: "Call to Arms")
- Most likely, Tholians originate from "Tholia", a word Klaang mentioned in Star Trek: Enterprise: "Broken Bow", but which Hoshi Sato could not translate. Due to the their involvement in the Temporal Cold War this could be the name of the Tholian homeworld and thus might be the capital of the Tholian Assembly.
- The Tholian Assembly was mentioned as a small note on a very large star chart graphic created for TNG:"Conspiracy." It was the image behind the chair in the room where Dexter Remmick was killed. It appears to be located within an outlined block, which may indicate that it was surrounded or was even a part of Federation territory at the time. It couldn't have been a member of the Federation, as this seems to conflict with "Call to Arms." It appears to be near Gamma Canaris IV, Berengaria VII, and Janus VI.