Chronia is the home planet of the Chronians in Ben 10: Ultimate Hero.
Chronia is a planet with certain predisposition toward the color purple. The planet is known to have cities with towering structures. The Chronians possess many powerful ships and equipment.
Chronia was thrown out of time and space after the Chronians misused their powers. All of the Chronians were unable to escape, except for Eon, who traveled to the Race Against Time timeline to free his race using the Hand of Armageddon. After he was defeated by the Ben Tennyson from that timeline, he was forced back to his homeworld. A second attempt was made by Eon to free his world, but ultimately, he failed once more.