From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
The Kaioshin Realm (界王神界, Kaioshinkai; FUNimation "Sacred World of the Kais"; Literally meaning "World King God Realm") is an area outside the macrocosm.
The Kaioshin Realm consisted of Planet Kaishin and many suns (and moons in the anime). North Kaioshin, South Kaioshin, East Kaioshin, West Kaioshin, Old Kaioshin, and Grand Kaioshin lived on Planet Kaishin. From here, they could watch over both the Next World and the Lower Realm (though even their eyes could not view the Demon Realm).