Utapau

Ringed by numerous moons, the remote sanctuary of Utapau is a planet pitted with enormous sinkholes. Its windswept surface is dry and desert-like, but deep in the porous crust, at the bottom of the sinkhole are pools of life-giving water. Many of the sinkholes on one of the planet's small continents are lined with intricate cities that stretch deep into caves and crevices beneath the planet's surface.