Borneo

Borneo was a rainforested area (PROSE: A Big Hand for the Doctor) on Earth. (AUDIO: Voyage to Venus, PROSE: Alien Bodies) By the 2040s, Borneo had lost its rainforests and was turned into the East Indies ReVit Zone by the World Zones Authority. (PROSE: Alien Bodies)

When the Sixth Doctor took him to Venus, Henry Gordon Jago mistook it at first for Borneo. (AUDIO: Voyage to Venus)