Stygeon Prime

Stygeon Prime is a cold, mountainous world, and near desolate except for the massive tibidees that call it home. Located on Stygeon Prime is one of the galaxy's most fortified prisons: the Spire. During the Clone Wars, Darth Sidious imprisoned his former apprentice, Darth Maul, in the Spire, and the Empire later took control of the feared penitentiary.