The Yridian homeworld was the home planet of the Yridian species. The Yridian yak was a well known animal from the planet. (DS9: "Accession")

The treasured Rings of Paltriss were removed from the planet many years ago. (DS9: "Melora")

According to the Star Trek: Star Charts, on page 60, the Yridia Prime was located in the Yridia star system. This system's primary was a G-type star. Yridia was located in the Beta Quadrant.
According to Decipher's Aliens sourcebook, the Yridian homeworld is called Yrda.

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