The Great Pit of Carkoon was located within the Dune Sea on the planet Tatooine. The large depression in the sand was the home of the rapacious, if slow-eating, sarlacc of Tatooine.
Its proximity to Jabba's Palace, paired with the torturous death provided by the sarlacc, made it an ideal spot for executions to be carried out for Jabba the Hutt's pleasure.
(The sarlacc was a semi-sentient, plant-like, omnivorous arthropod found on several planets across the galaxy. Not much was known about this creature, but it was unique in terms of galactic flora. It lived to be tens of thousands of years old, and reproduced by spores. One particular specimen was located in the Great Pit of Carkoon on Tatooine.)
