Tagra
Tagra was an inhabited planetary system. This system was one of six located within the Argolis Cluster, a stellar cluster in the Alpha Quadrant. The system had at least four planets, including Tagra IV. After developing warp travel, this planet had or was being inducted into the  in the late 2250s.

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

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

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Star systems