Welcome to Tanjung Puting National Park
Tanjung Puting is the most popular tourist destination in Kalimantan, and for good reason. A near guarantee that you’ll see free-roaming orang-utans, combined with a storybook journey up a winding jungle river, gives this adventure world-class appeal. And though remote, the park is easily reached via direct flights from Jakarta and Surabaya.
The park is best seen from a klotok, a ramshackle, multistorey liveaboard boat that travels up Sungai Sekonyer from Kumai to the legendary rehabilitation centre at Camp Leakey. During the day you lounge on deck surveying the jungle for wildlife with binoculars as the boat chugs along its narrowing channel, stopping to convene with semi-wild orang-utans at the three main feeding stations. Despite an increase in visitor numbers and boats in recent years, the trip is still a fine introduction to the rainforest, and one of the most memorable experiences you’ll have in Kalimantan.
Source : https://www.lonelyplanet.com/indonesia/tanjung-puting-national-park