Tol Ado was a planetary body in the Outer Rim Territories, specifically situated inside the Tol Ado system; it is classified as a planet.
Luke Skywalker was at one time taken prisoner and held on this Imperial prison planet, only to later break free. The planet's atmosphere was filled with thick, toxic clouds containing hydrogen fluoride. The temperature on the surface hovered around 477 degrees Celsius, and the atmospheric pressure was ten times the standard galactic level. The prison complex was protected by 124 sensor stations in orbit, and it held 1,400,036 cell blocks, each containing 4,000 individual cells.