In 2372, Jake Sisko was doing some research for a story that included a Kavarian tiger-bat, and tried to find out how it smelt. Kasidy Yates suggested that Quark might know someone who had been there, since she hadn't. (DS9: "For the Cause")
Benjamin Sisko stated Kavaria and the Dreon system to be neighbors, but Kasidy (perhaps maliciously) didn't agree. She claimed Kavaria was located too close to the Badlands for her comfort, although Sisko then implied Dreon was close to the Badlands too.
Kavaria might be the place of origin of Kavarian olives.
According to the Star Trek: Star Charts (p. 46), Kavaria was located in the Kavaria system. This system was located in non-aligned space, in the Alpha Quadrant. This was a single star system. Primary was a Class K star with a magnitude of +7, which was 1/10 as bright as Sol.