Top 10 Nature Reserves in Malaysian Borneo
Malaysian Borneo — the states of Sabah and Sarawak on the northern third of the world's third-largest island — protects some of the oldest and most biologically rich rainforest on the planet. This is not open country and there are no plains herds; the wildlife here is arboreal, cryptic, and adapted to a dense, humid, evergreen forest that has stood in some places for well over a hundred million years. Watching it means river cruises at dawn, patient waits beneath fruiting trees, and night walks by torchlight. These ten reserves are the finest places to encounter the orangutans, proboscis monkeys, hornbills, and pygmy elephants that make Bornean wildlife unlike anywhere else.
Danum Valley Conservation Area, Sabah
Danum Valley is the benchmark: roughly 440 square kilometres of undisturbed primary lowland dipterocarp rainforest, never logged and never settled, in the heart of Sabah. Its canopy trees soar past 70 metres, and the forest holds wild orangutans, Bornean gibbons, red leaf monkeys, and the elusive clouded leopard. Access is controlled and accommodation limited, which keeps visitor numbers low and the experience genuinely wild. A canopy walkway and a network of trails allow close study of a forest that scientists regard as one of the most important research sites in the tropics.
Kinabatangan River, Sabah
The floodplain of the Kinabatangan, Sabah's longest river, has become the region's premier wildlife-watching destination, precisely because forest clearance for oil palm has squeezed the animals into the remaining riverside strips. That concentration makes for extraordinary boat-based viewing: proboscis monkeys gathering in riverside trees at dusk, Bornean pygmy elephants along the banks, crocodiles, and eight species of hornbill overhead. It is a conservation paradox — the wildlife is easy to see because its habitat has shrunk — and a reminder of what is at stake across the island.
Kinabalu Park, Sabah
A UNESCO World Heritage site built around Mount Kinabalu, at 4,095 metres the highest peak between the Himalayas and New Guinea, this park spans an astonishing range of habitats from lowland forest to alpine scrub near the summit. That gradient produces exceptional plant diversity, including many endemic orchids and the giant Rafflesia and pitcher plants. The two-day climb to the summit is one of Southeast Asia's classic ascents, while the montane forests around the park headquarters are superb for birds found nowhere else.
Sepilok, Sabah
Near Sandakan, the Sepilok Orangutan Rehabilitation Centre is the best-known place in the world to see orangutans, caring for orphaned and displaced apes and returning them to the surrounding forest reserve. Alongside it, the Bornean Sun Bear Conservation Centre protects the world's smallest bear, and the Rainforest Discovery Centre offers excellent canopy-level birding. Sepilok is accessible and popular, and while it is a rehabilitation facility rather than untouched wilderness, it plays a serious conservation role and is an unmatched introduction to the island's flagship species.
Tabin Wildlife Reserve, Sabah
One of the largest wildlife reserves in Malaysia, Tabin was established to protect a core of forest surrounded by plantation, and it shelters pygmy elephants, orangutans, and the Bornean banteng, a wild cattle species. Its mud volcanoes draw animals seeking minerals, creating natural gathering points, and its accessible lodges and night drives make it a rewarding, less-crowded alternative to the Kinabatangan.
Maliau Basin Conservation Area, Sabah
Known as Sabah's "Lost World", the Maliau Basin is a near-circular, cliff-rimmed catchment of pristine forest that was so inaccessible it was barely explored until the late twentieth century. It remains one of the wildest places in Borneo, a mosaic of forest types with multi-tiered waterfalls and a wealth of species, visited mainly by researchers and well-prepared trekkers. This is not a casual destination, but for the experienced it is among the most pristine forests on the island.
Gunung Mulu National Park, Sarawak
A UNESCO World Heritage site in Sarawak, Mulu is famous above all for its caves: the Sarawak Chamber is one of the largest known cave chambers in the world, and Deer Cave hosts a nightly exodus of millions of bats that spiral out at dusk in ribbons visible for kilometres. Above ground, the razor-sharp limestone Pinnacles and the surrounding rainforest complete a landscape of extraordinary geology and biodiversity. Access is chiefly by a short flight into the park's own airstrip.
Bako National Park, Sarawak
Sarawak's oldest national park, on a peninsula near Kuching, is small but remarkably rewarding and unusually easy to visit. Reached by boat, Bako almost guarantees sightings of proboscis monkeys — the big-nosed, pot-bellied monkey found only on Borneo — along with silvered langurs, bearded pigs on the beach, and a striking range of habitats from mangrove to heath forest packed into a compact area. Its accessibility from a major city makes it one of the best-value wildlife experiences in the region.
Lambir Hills National Park, Sarawak
Near Miri, Lambir Hills protects a patch of lowland forest that holds one of the highest recorded tree diversities anywhere on Earth — a single research plot here has documented an astonishing number of tree species. For visitors it offers accessible trails, waterfalls with bathing pools, and excellent birding, a manageable day-trip introduction to the botanical richness that makes Bornean forest globally significant.
Turtle Islands Park, Sabah
Off the coast north of Sandakan, this small marine park protects islands where green and hawksbill turtles come ashore to nest year-round. Under ranger supervision, overnight visitors can watch females haul out to lay and see hatchlings released, one of the few places in the region where turtle nesting is both protected and carefully opened to the public. It is a marine complement to Borneo's forest reserves and a reminder that the island's biodiversity extends well offshore.
A forest under pressure
No honest account of Bornean wildlife can ignore what surrounds these reserves. Over the past half-century, vast areas of the island's lowland forest have been cleared, first for timber and then for oil palm, and the reserves that remain are increasingly islands in a sea of plantation. This is why the Kinabatangan's wildlife is so easy to see — the animals are squeezed into the last riverside strips — and why corridors linking fragments of forest have become a conservation priority, allowing orangutans and elephants to move between protected blocks. Visiting responsibly matters here in a direct way: tourism revenue is one of the few economic arguments for keeping forest standing rather than converting it, and choosing operators and lodges that fund conservation and employ local communities turns a holiday into a small vote for the forest's survival.
Planning a Borneo trip
Bornean wildlife-watching rewards slowness and an early start: the best hours are dawn and dusk, on the river and in the forest, and the middle of the day is often quiet. The lowland reserves are hot and humid year-round; the drier months, roughly March to October, are generally easier for travel, though rain is possible at any time. Many of the finest reserves — Danum, Maliau, Mulu — have limited access and require advance booking, which is part of what keeps them wild. Pair a river reserve such as the Kinabatangan with a primary-forest reserve such as Danum for the fullest picture of what this ancient forest still holds.
Every reserve mentioned here is on the interactive map. Use it to see how Sabah's and Sarawak's parks connect across northern Borneo and to plan a route between river, forest, and coast.