Kathol was an arboreal planet in the Kathol system, which gave its name to Kathol sector. Over one million years before the rise of the Galactic Republic, the planet was the homeworld of an ancient and extinct sapient and spacefaring species, known as the Kathol, and was the center of the collapsed Kathol Realm. Kathol had three major continents, Scyon, Adragos and Xjare.
Kathol was the center of several important galactic events throughout history, and was the center of the Great Collapse as well as the location of the Hellmouth. Kathol was destroyed in 2,103 ABY, when the Charon Dominion destroyed Kathol in the creation of the Aperture, enabling them to traverse out from the Otherspace galaxy and into the realspace galaxy.