Three main regions
Where rainforests grow
The Met Office finds tropical rainforest climates in South America, Africa and South-east Asia. Met Office Tropical rainforests are found primarily in South and Central America, West and Central Africa, Indonesia, parts of Southeast Asia, and tropical Australia. Britannica Tropical rainforests grow mainly in three regions: the Malesian botanical subkingdom, from Myanmar to Fiji, including Thailand, Malaysia, Indonesia, the Philippines, Papua New Guinea and parts of tropical Australia; tropical South and Central America, especially the Amazon basin; and West and Central Africa. Britannica
South and Central America
One of the most important biodiversity hotspots in the world, the Met Office says, is the Amazon basin. Met Office The Amazon Basin covers 2,700,000 square miles (7,000,000 square kilometers), making it the largest drainage basin in the world. It occupies more than 40% of South America’s land area, and much of the basin is covered by dense tropical rainforest. NASA JPL
The Amazon has its own page: the basin, the rain, the flying rivers, and the disagreements.
West and Central Africa
The tropical rainforest of Africa was the habitat in which the ancestors of humans evolved, and it is where the nearest surviving human relatives — chimpanzees and gorillas — live still. Britannica
Where altitude increases along the borders of equatorial rainforests, the vegetation is replaced by montane forests, as in the highlands of New Guinea, the Gotel Mountains of Cameroon, and in the Ruwenzori mass of Central Africa. Britannica
The Malesian forests
Tropical rainforests grow mainly in three regions: the Malesian botanical subkingdom, from Myanmar to Fiji, including Thailand, Malaysia, Indonesia, the Philippines, Papua New Guinea and parts of tropical Australia; tropical South and Central America, especially the Amazon basin; and West and Central Africa. Britannica
Other kinds of rainforests include the monsoon forests, most like the popular image of jungles, with a marked dry season and a vegetation dominated by deciduous trees such as teak, thickets of bamboo, and a dense undergrowth. Britannica Mangrove forests occur along estuaries and deltas on tropical coasts. Britannica
It is no surprise, therefore, to find the greatest diversity of flowering plants today in the tropical rainforests where they first evolved. Britannica The flowering plants (angiosperms) first evolved and diversified during the Cretaceous Period about 100 million years ago, when global climatic conditions were warmer and wetter than those of the present. The vegetation types that evolved were the first tropical rainforests, which blanketed most of Earth’s land surfaces at that time. Britannica
Temperate rainforests, on cooler coasts, are a different kind of forest: see temperate rainforests.