Rainforest

A rainforest was a tropical forest.

On Earth
The Eleventh Doctor, Amy Pond and Rory Williams encountered the Nadurni in the Amazon rainforest in 1827. (AUDIO: The Eye of the Jungle)

The auction of the Relic took place in the late 21st century in the Unthinkable City in an East Indies rainforest. (PROSE: Alien Bodies)

In the later half of the 21st century, the Amazon's ecosystem collapsed and the rainforest turned into a desert. (AUDIO: Loups-Garoux)

The Forest of Cheem was descended from the tropical rainforest of Earth. (TV: The End of the World)

Elsewhere
Most of the planet of Kar-Charrat was covered by dense rainforest. (AUDIO: The Genocide Machine)