Thalos
Thalos was an inhabited planetary system in the Alpha Quadrant. It had at least seven planets, including Thalos VI and Thalos VII.

By the 2250s, the  had made first contact with one of the planets in this system. This planet was home to a warp capable civilization, which after first contact, had or was in the process of being inducted into the Federation.

In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. The system's symbol had a blue color, indicating that it was affiliated with the Federation. ()

In 2399, the location of Thalos was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. The system was in or near to Ferengi space. () 

In 3189, the location of Thalos was denoted on a holographic star chart of the galaxy at Federation Headquarters. ()

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Star systems