A jungle was a very dense forest, usually located in hot climates. The Doctor encountered jungles on many planets in his travels, including an artificial jungle on the Ark. (TV: The Ark) He also had a jungle in his TARDIS. (PROSE: Sky Pirates!) Planets that were dominated by their jungles were referred to as jungle planets.
Jungles on Earth
Jungles on named planets
Planets which had jungles included Aneas, (PROSE: Sky Pirates!) Basingstoke, (COMIC: Supernature) Betrushia, (PROSE: St Anthony's Fire) Catastrophea, (PROSE: Catastrophea) Chloris, (TV: The Creature from the Pit) Deva Loka, (TV: Kinda) Eden, (TV: Nightmare of Eden) Hondran, (COMIC: The Hunters) Jenggel, (PROSE: Combat Rock) Kar-Charrat, (AUDIO: The Genocide Machine) Kembel, (TV: The Daleks' Master Plan) Lumana, (COMIC: House Pests) Magella, (PROSE: Birth of a Legend) Marinus, which had one called the Screaming Jungle, (TV: The Keys of Marinus) Mechanus, (TV: The Chase) Oroobia, (PROSE: The Doctor Trap) Planet One, one of which included large mushroom-like structures, (TV: The Pandorica Opens) Quorus, (PROSE: Doctor Who Fights Masterplan "Q") Skaro, which had a petrified jungle, (TV: The Daleks) Spiridon, (TV: Planet of the Daleks) Tigella, (TV: Meglos) YT45 (AUDIO: The Mind's Eye) and Zeta Minor. (TV: Planet of Evil)