The Vidiian homeworld was an inhabited planet in the Delta Quadrant. This was the homeworld of the humanoid Vidiians and the capital planet of the Vidiian Sodality.
In the 4th century, the Phage began to attack the population of this planet. This disease afflicted the Vidiians for the next two thousand years until a cure was discovered in the 2370s.
In the 24th century, Motura was a noted sculptor on this planet. (VOY: "Phage")
This planet was only mentioned in dialogue.
According to the Star Trek: Star Charts (p. 78), this Class M planet was named Vidiia Prime. The dominant species was the Vidiians. There was no information on the capital city, the world's population, or when the Vidiians became warp-capable.