Where to see orangutans in Indonesian Borneo

“One of the natural wonders of the world”, according to the UK’s Orangutan Foundation, Taman Nasional (National Park) Tanjung Puting is home to the world's largest population of wild orangutans and represents their best hope for survival.

It was at Tanjung Puting in 1971 that leading orangutan authority Dr Biruté Galdikas established the Camp Leakey research station — an instrumental step in bringing the plight of the park’s most famous resident to worldwide attention.

Set amid the largest swathe of coastal tropical heath and peat swamp forest, which used to cover much of southern Borneo, Tanjung Puting started out as a game reserve in 1935 before becoming a National Park in 1982.

The best way to experience the wonders of Tanjung Puting is on a traditional klotok (houseboat) puttering gently along Sungai Sekonyer as you search for pot-bellied macaques, hornbills and the odd crocodile.

Starting from the Kumai river port in the central Kalimantan city of Pangkalan Bun, your guides will typically stop at three main feeding stations within the park, where you will get to experience semi-wild orangutans during feeding sessions. The best option for this is at Tanjung Harapan, but you’ll also stop at Pondok Tangui. Your final destination will be Camp Leakey, a 4-4 ½ hour journey upriver.

From the docking point, be prepared for a 45-minute walk to the first feeding platform at Camp Leakey, on a flat and well-maintained path. Here, as well as orangutans, you will see Bornean bearded pigs, gibbons and mangrove-loving proboscis. Camp Leakey is your best chance to see orangutans — most were released around here and stay close to the site. In general, orangutans around Camp Leakey are the most relaxed around humans. Look out for Tom, the camp’s alpha male (but if you do see him, be careful not to engage in a staring match).

Once feeding time is over, you can explore the camp’s excellent information centre. Tanjung Puting offers plenty of other activities including birding, hiking and wildlife tours — as well as cultural trips to remote villages.

Sebangau National Park is rarely visited by tourists and has been at serious risk from illegal logging and land conversion, which is why I'm so keen to encourage visitors to come here.

The Katingan River flows through Sebangau and its forest-lined banks offer a wonderful experience for intrepid travellers. You can canoe through the canals and trek into the park from the river, going via tiny indigenous villages to track orangutans, wild proboscis monkeys and gibbons. You might see sun bears, or even an elusive clouded leopard, as well as spotting many bird species – I have seen one of the most endangered birds - Storm’s stork - as well many magnificent hornbills, kingfishers and raptors.

Trekking through the swampy forests in Sebangau can be a challenge as trails are either non-existent or very hard to follow. It's not for the faint-hearted, but Sebangau is a true hidden gem in Kalimantan and one I can highly recommend.

The Kahayan River, immediately east of Sebangu National Park, is a real hidden gem which doesn't feature highly on most 'mainstream' orangutan-spotting itineraries. The main reason I recommend the Kahayan River to almost anyone who visits Indonesian Borneo is because it's here that you can combine wildlife spotting with real and meaningful cultural interactions with the indigenous Dayak people which is, I believe, key to ensuring the long-term survival of both the orangutans and the people who live here.

You access the Kahayan River from the town of Palangkaraya, which is close to the forested island of Pulau Kaja. This is a pre-release habitat for rescued orangutans managed by the Borneo Orangutan Survival Foundation, and it's possible to spot orangutans from the river. Downstream from Palangkaraya are Dayak villages of Bukit Rawi, Sigi Tumbang Nusa and Pilang, where you can learn about indigenous religion, cultures and traditional livelihoods. At night the captain will simply find a sheltered location on the bank to moor the boat – it's a true expedition!

If you're solely interested in tracking orangutans, the Kahayan River area might not be for you (although it can be easily combined with a visit to nearby Sebangu National Park). However, if you're remotely interested in traditional culture and the interaction of cultural preservation and wildlife conservation, I can't recommend this area highly enough.