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Tonga lies in the tropics and where land hasn't been cleared, it is normally occupied by tropical rainforest. Rainforests are defined as forests with high rainfall, with definitions setting minimum annual rainfall between 1750–2000 mm (68-78 inches).
Tongatapu the main island has all but been cleared it's native forests in favour of plantations and settlements. Eua the neigbouring island still has large areas of natural habitat of which most is tropical rainforest. Most other islands have good rainforest cover.
Species within the rainforests of Tonga include coconut palms, pandanus palms, banyan trees, ferns, and cedars.