Lakertya

Lakertya was the homeworld of the Lakertyans. It was conquered by the Rani and her Tetraps from their planet Tetrapyriarbus. The Seventh Doctor repelled the Tetraps who turned on the Rani. The Rani built a base of operations in a ravine, and she littered the area with traps. (TV: Time and the Rani)

Lakertya was in the same solar system as Carsus. (PROSE: Spiral Scratch)