Jungle

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!)

Jungles on Earth
The Amazon was a jungle in South America. (TV: The Green Death et. al.)

Another South American jungle was home to a mushroom known as the Great Power. (PROSE: Doctor Who and the Daleks)

The First Doctor, John and Gillian visited a jungle on Earth in 2035 where they encountered the Caterpillar Men. (COMIC: The Caterpillar Men)

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) 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)

Jungles on unnamed planets
The First Doctor, Steven Taylor and Dodo Chaplet defeated Questor in the Jungle of Tropicalus. (COMIC: Death to the Doctor!)

The First Doctor, John and Gillian searched for an escaped didus in a jungle on a planet which was also inhabited by a hostile native tribe. (COMIC: The Didus Expedition)

The Second Doctor, John and Gillian tested an exploration truck he had invented in a jungle on a planet where they also encountered and destroyed a group of Daleks. (COMIC: Jungle Adventure)

The Second Doctor and Jamie McCrimmon encountered Quarks in a jungle on an Earth-like world. (COMIC: Jungle of Doom)

The Second Doctor rescued Jason Wurlitzer from dwarfs in a jungle on an Earth-like world. (COMIC: Operation Wurlitzer)

A planet used as a laboratory by the Daleks was mostly jungle. (PROSE: The Dalek Factor)