The banana plantation on Ape Atoll is an underground area involved in the final battle in the Monkey Madness quest, and is only accessible during the quest. It consists of a square cave containing an enormous amount of banana trees with a large gorilla statue at its centre. Above the trees, encircling the top of the statue, is a large, square wooden platform on which the quest fight takes place.
During and after the fight, it is possible to descend from the platform, down to where the banana trees are, via trapdoors at the four corners of the arena. A few small, poisonous spiders are found amongst the trees. It should be noted that the spiders' poison start at 38 life points, and lasts a total of 13 poison hits. When poisoned, however, it is easy to quickly pick a couple of bananas to heal.
In the centre of the lower area is the base of the gorilla statue. Players can enter the base of the statue through a crack in it. Inside is Bonzara, a mysterious priest who claims that he and the player will meet again. He offers to teleport the player out of the arena at the end of the conversation. However, the teleport puts players in the jungle on Ape Atoll, where it may be possible to be poisoned.
- This is the largest banana plantation in Gielinor located underground. Here, the banana trees do not have access to sunlight, and have to use the glowing fungi for photosynthesis.
- When walking to the plantation, on the edge where also the trapdoors are, there are floor spikes, which have the examine "Human sieve creation".