This area has a high biodiversity and consists of various types of ecosystems. The forests in this national park area consist of swamp forest, peat swamp, freshwater swamp forest, tropical mapah forest, mangrove forest, and mountain forests.
Some of the existing plants in the Gunung Palung National Park are jelutung (Dyera costulata), ramin (Gonistylus bancamus), resin (Agathis berneensis), pulai (Alstonia scholaris), rengas (Gluta renghas), ulin wood (Eusideroxylon zwageri), plant mangroves (Rhizopora spp. ), kendeka (Bruguiera spp. ), and various medicinal plants.