Sullust was the primary planet of the Sullust system, located in the Outer Rim Territories at the conjuncture of the Rimma Trade Route and the Silvestri Trace. It was the homeworld of the Sullustans and became one of many Allied HQs. All of Sullust was composed of multicolored rock, veined by lava channels; the planet went through atmospheric blackouts caused by gouts of smoke and ash. The underground of the planet was more stable and habitable and was occupied by the native Sullustans who navigated the tunnels (housing edible lichen gardens and potable water) with an innate sense of direction.

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