Tanjung Puting, National park in Central Kalimantan, Indonesia.

Tanjung Puting is a national park in Central Kalimantan, Indonesia, covering 415,040 hectares (about 1,025,600 acres) of dryland dipterocarp forest, peat swamp forest, heath forest, mangrove and coastal forest, and secondary forest. It lies along the Sekonyer River in the southeast of West Kotawaringin Regency, near Pangkalan Bun, and is accessed from Kumai by speedboat along the Kumai and Sekonyer rivers to Camp Leakey, a journey of about 1 hour and 30 minutes at best.

In 1937 the Dutch East Indies government set aside the Sampit Wildlife Sanctuary, 205,000 hectares, to protect orangutans and proboscis monkeys. Renamed Tanjung Puting in the 1970s, it was enlarged to 300,040 hectares by 1978 and became a UNESCO Biosphere Reserve in 1977. A 1996 forestry decree added former logging concession and water areas, creating the 415,040-hectare national park.

The name Tanjung Puting translates as Sharp Cape and refers to the shape of the land extending into the sea. Local guides lead travelers along the waterways and explain how the forest serves both wildlife and people, with daily routines shaped by the tides and the rhythm of the river.

Visitors arrive through Pangkalan Bun airport and travel by klotok, a motorized houseboat with cabins and crew, through the river channels. Journeys last several days, with boats stopping at ranger station docks to access walking trails and feeding platforms where orangutans and other wildlife gather.

Camp Leakey, founded in 1971 with assistance from the Leakey Foundation, was the first of four research centres in the park and the place where Biruté Galdikas began studying rescued and orphaned orangutans. Her work appeared on the cover of National Geographic in October 1975. The park also runs Pondok Ambung station, established in 2005 for research on all wild species.