Trench Mountain National Park is one of nature conservation area which has a biodiversity of high-value, and various types of ecosystems including mangrove forests, swamp forests, peat swamp, freshwater swamp forests, tropical pamah forest, and jungle-covered mountains that always fog . Appointed Minister of Forestry, Decree No. 448/Kpts-II/1990 by 90,000 hectares area.
This national park is the only tropical forest area Dipterocarpus the best and largest in Borneo. Approximately 65 percent of the region, is still primary forest is not disturbed by human activities and have many plant communities and wildlife.
Like other areas of West Kalimantan, this area is generally covered by jelutung (Dyera costulata), ramin (Gonystylus bancanus), damar (Agathis borneensis), Pulai (Alstonia scholaris), Rengas (Gluta renghas), ironwood (Eusideroxylon zwageri), Bruguiera sp ., Lumnitzera sp., Rhizophora sp., Sonneratia sp., the strangler fig, and medicinal plants.
Unique plants belonging to this national park is the black orchid (Coelogyne pandurata), which is easily seen in the River Matan especially in February-April. The appeal of black orchid flowers appear on the form marked with green color combination with black spots on the center of the flower, and bloom time between 5-6 days.
There are 190 recorded bird species and 35 species of mammals that acts as pemencar plant seeds in the forest. All families of birds and probably of all bird species in Borneo, there are in the forest parks.
Animals often seen in Trench Mountain National Park of proboscis monkey (Nasalis larvatus), orangutan (Pongo satyrus), four-striped ground squirrel (Lariscus hosei), barking deer (Muntiacus muntjak pleiharicus), bear (Helarctos malayanus euryspilus), monkey (Macaca nemestrina nemestrina), klampiau (Hylobates muelleri), slow loris (Nyticebus coucang borneanus), rhinoceros hornbill (rhinoceros Buceros borneoensis), deer (Tragulus Napu borneanus), forest chicken (Gallus gallus), hornbills ivory (Rhinoplax vigil), Siamese crocodile (Crocodylus siamensis ), ivory turtle (Orlitia borneensis), and turtle urn (Caretta caretta). No less interesting presence of squirrels walnuts (Rheithrosciurus macrotis) are very rare, and difficult to see.
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