Yridia
Yridia was a star system in Sector 2158, a region of space in the Beta Quadrant. This system included the planet Yridia I. (; }

In 2256, this system's location was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the . ()

In 2257, during the first , this star system was occupied by the Klingons. ()

In 2258, the system's location was labeled on a star chart seen on the main viewscreen of the . ()

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 . () 

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

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Stars