Samboja Lestari, Orangutan and sun bear sanctuary in Balikpapan, Indonesia.

Samboja Lestari is a protected area near Balikpapan that cares for rehabilitated orangutans and sun bears across approximately 2,000 hectares. The grounds include a medical clinic, quarantine facilities, educational forest spaces, and an eco-lodge with 26 rooms of different types.

The sanctuary began in 2001 when the Borneo Orangutan Survival Foundation established it on damaged land through extensive replanting efforts. These efforts introduced around 740 tree species to the area over time.

The name Samboja Lestari roughly translates as 'Samboja Forever', from the Indonesian word lestari meaning lasting or sustainable. Founder Willie Smits framed the project around People, Planet, Profit, aiming to generate income for local people through conservation work. Visitors can see this in the lodge, built on local architectural lines with walls of recycled materials, and in guided tours to the orangutan and sun bear sanctuaries.

Samboja Lodge provides accommodation for visitors and volunteers; its design follows local architecture, and its interior and exterior walls are made of recycled materials. Overnight and day guests join guided tours of the orangutan sanctuary islands and the sun bear sanctuary, and the profits help fund the BOS Foundation's conservation work at Samboja Lestari. The site lies about 38 kilometres from Balikpapan.

Some seeds used in the nursery were recovered from orangutan faeces, and the first plantings relied on drought-resistant sungkai and Acacia mangium legumes. Founder Willie Smits mixed sawdust, fruit remnants from the orangutan cages, cattle and chicken manure, and a microbiological agent of sugar and cow urine into compost for the seedlings.