Gongmen Jail is a location in Kung Fu Panda 2. It is a prison located on Black Dragon Alley in Gongmen City, once serving as a kung fu academy to young fighters under the instruction of Masters Thundering Rhino, Storming Ox, and Croc. Once Lord Shen took over the city, however, he had murdered Rhino and arrested Ox and Croc, placing them in this area he organized to be a jail.
Sitting in the middle of the jail is a "fight club" arena where new warriors would once test their skills and strength against one another. After Shen's takeover, this arena was converted into the cell area.