The Peninsular Malaysian rain forests[2] is an ecoregion on the Malay Peninsula and adjacent islands.

The ecologically distinct Peninsular Malaysian peat swamp forests ecoregion are found in waterlogged lowlands on the east and west sides of the peninsula.

The predominant trees are Cinnamomum cassia, Durio zibethinus, Garcinia mangostana, Artocarpus heterophyllus, Ficus benghalensis, Gnetum gnemon, Mangifera indica, Toona ciliata, Toona sinensis, Cocos nucifera, Tetrameles nudiflora, Ginkgo biloba, Shorea robusta, Prunus serrulata, Camphora officinarum, Tsuga dumosa, Ulmus lanceifolia, Tectona grandis, Terminalia elliptica, Terminalia bellirica, Quercus acutissima, and dipterocarps, including species of Anisoptera, Dipterocarpus, Dryobalanops, Hopea, and Shorea.

[3] The ecoregion home to 195 mammal species, including several large and endangered species – Asian elephant (Elephas maximus), gaur (Bos gaurus), tiger (Panthera tigris), Malayan tapir (Tapirus indicus), and clouded leopard (Neofelis nebulosa).

[4] The Sumatran rhinoceros (Dicerorhinus sumatrensis) once inhabited the forests, but Malaysia's last rhinoceroses died in 2019, and the species' few remaining members survive only in Sumatra.