Lakertya

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

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