The Kalsunor system, a star system, resided within the Esstran sector of the Outer Rim Territories; it was the home system of the planet called Kalsunor.
During the Galactic War in 3638 BBY, a conflict fought between the Galactic Republic and the reconstituted Sith Empire, the Republic forces managed to breach the Stygian Caldera and subsequently captured the Kalsunor system.