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

Jungles on named planets

Aneas (PROSE: Sky Pirates!)
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)
Marinus' Screaming Jungle (TV: The Keys of Marinus)
Mechanus (TV: The Chase)
Oroobia (PROSE: The Doctor Trap)
Quorus (PROSE: Doctor Who Fights Masterplan "Q")
Skaro's petrified jungle (TV: The Daleks)
Spiridon (TV: Planet of the Daleks)
Tigella (TV: Meglos)
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 an unnamed planet which was also inhabited by hostile native tribe. (COMIC: The Didus Expedition)
The Second Doctor, John and Gillian tested an exploration truck he had invented in a jungle on an unnamed 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 unnamed world. (COMIC: Jungle of Doom)
The Second Doctor rescued Jason Wurlitzer from dwarfs in a jungle on an unnamed world. (COMIC: Operation Wurlitzer)
An unnamed planet used as a laboratory by the Daleks was mostly jungle. (PROSE: The Dalek Factor)