Tanjung Puting National Park has several ecosystems consist of lowland tropical rainforest, dry land, forest, freshwater swamp forests, mangrove forests, coastal forests and secondary forests.
This area is dominated by lowland forest plants like Gelatin (Dyera costulata), Ramin (Gonystylus bancanus), Meranti (Shorea sp.), Keruing (Dipterocarpus sp.), and Rattan.
An endangered species endemic and protected, contained in the forest Tanjung Puting National Park include the orangutan (Pongo Satyrus), proboscis monkey (Nasalis Larvatus), maroon leaf monkey (Presbytis rubicunda rubida), bears (Helarctos malayanus erysipelas), deer (Tragulus javanicus close), clouded leopard (Neofelis nebulosa), and a cat (Prionailurus bengalensis borneoensis).
Tanjung Puting National Park is the first location in Indonesia as an orangutan rehabilitation center. There are three locations for the rehabilitation of orangutans in Tanjung Harapan, Pondok Tanggui, and Camp Leakey.
Bornean orangutan has a dark reddish fur and a tail. In line with the growth of age, adult males develop cheek pads to form. Getting older, the greater the cheek pads so impressed sinister face. Tanjung Puting National Park designated by UNESCO as a Biosphere Reserve in 1977 and is the Sister Park with Malaysia.