Delios VII
Delios VII was the inhabited seventh planet in its star system. One of the tribes found on this planet was the Karis Tribe. This planet was located somewhere in the Alpha or Beta Quadrant.
In 2373, Janeway told Chakotay about a ritual practiced by shamans of this tribe to increase the electrical resistance of their skin. This practice protected them from the plasma discharges in their sacred caves. (VOY: "Sacred Ground")
This planet was only mentioned in dialogue.