The Three Saviors are the three oases within Sahramina, around which the towns of Kebili, Meharrize, and Zerzura have been built. Each oases does not have its own name, but is instead referred to by its nearby town.
All three oases are known to be not entirely natural - the centers of each are incredibly deep, compared to what is typical of desert oases, and the remnants of ancient stoneworks can be seen in the depths. The origins are poorly understood, however, and none are quite sure how they came to be, or why.