The Tomo Craters were located on the planet Vanqor in the Uziel system.
Formed by an ancient meteor shower—thousands of years in Vanqor's past—the Tomo Craters were part of the world's vast areas of rugged terrain that included also deserts and high plateaus.
In this dry, remote section of the planet marked by deep craters and fissures, the planet's expansionist government, under the rule of Van-Ith, created a detention facility—"The Tomo Camp"—which retained prisoners from other worlds in the Uziel system, planets that had been invaded and conquered by Vanqor.
In 25 BBY, Anakin Skywalker and his Jedi Master Obi-Wan Kenobi, crash-landed on Vanqor with a crew of TY44 surveillance outpost workers—resistance fighters from the neighboring planet of Typha-Dor whom they'd come from the galactic Core to rescue. Kenobi infiltrated the Tomo Craters, and its infamous camp, to rescue his Padawan and resistance-fighter comrades. Unfortunately also, however, in the midst of their escape, the two Jedi were forced by enemy fire down into the dark depths of the Tomo Craters themselves—into the foul nesting places of the savage beasts called gundarks—out of which they had to fight their way.
By mission's end, the Jedi duo assisted Typha-Dor to fend off Vanqor's attempts to invade their planet, and to help mediate a peace between the two worlds.
- The Complete Star Wars Encyclopedia