Conservation and science in Danum Valley

Danum Valley is 438 square kilometres of lowland rainforest that was never logged. It sits 2.5 hours by road from Lahad Datu and it holds some of the tallest tropical trees on earth. People come here for the orangutans seen on most stays and for the gibbons heard every dawn but the reason the wildlife is still here is the science. In the 1980s researchers set up a camp on the edge of the Danum River to study the forest. Over the next forty years their work proved how valuable this ecosystem is and gave the state government the exact data it needed to protect the area permanently from commercial timber extraction. Today the research station is one of the most productive in the tropics and tourism provides the financial machinery that keeps the perimeter secure. When you book a stay inside the valley, the conservation fees embedded in your permits pay for the anti-poaching ranger patrols and the physical facilities. This guide explains how the protection works, what the science is finding and what you actually see of it when you visit.

Plan your Danum week!

The scientific effort at Danum is anchored by the Danum Valley Study Centre. Established in 1986, it serves as the physical base for the South East Asia Rainforest Research Partnership. The partnership began in 1984 under the Royal Society and the resulting work has made Danum one of the 3 leading tropical research stations in the world alongside Barro colourado Island in Panama and La Selva Biological Station in Costa Rica. The facility has hosted over 500 research projects including 156 post-doctoral studies, 175 doctoral studies and 85 master's degrees. The resulting output spans more than 700 peer-reviewed publications that shape modern tropical ecology.

One of the most ambitious projects is the 50-hectare ForestGEO plot. Part of the Forest Global Earth Observatory network administered by the Smithsonian Institution, this plot lets researchers track differences across the lowland dipterocarp forest and changes over time. Researchers initiated the plot in 2010 and they map, measure and identify every single woody stem with a diameter at breast height greater than 1 centimetre. The grid currently holds roughly 260,000 mapped stems across nearly 700 tree species. Researchers repeat the census every 5 years to record which trees have grown, died or taken root and assess how shifting rainfall and drought affect the forest.

The work extends from the subterranean root networks to the upper atmosphere. The Malaysian Meteorological Department operates a 100-metre atmospheric monitoring tower on Bukit Atur, 10 kilometres by road from the study centre. The tower sits at an elevation of 427 metres above sea level and it rises well above the 70-metre dipterocarp canopy. Established in 2003, it functions as a global station within the World Meteorological organisation's Global Atmosphere Watch network. Because the station sits inside a vast expanse of unpolluted primary forest, it provides the international scientific community with an uncorrupted atmospheric baseline to conduct eddy-covariance measurements of greenhouse gases, reactive trace gases and aerosols to calibrate global climate models.

Decades of research at Danum Valley have changed how scientists understand tropical forests. These findings anchor the conservation work.

• The giant of the tropics: Danum Valley conceals the world's tallest known tropical tree. Named Menara, it is a Yellow Meranti that measures exactly 100.8 metres. Researchers discovered it using airborne Light Detection and Ranging and verified the height with a physical tape drop. Despite weighing 81,500 kilograms, its centre of gravity is highly symmetrical and keeps it from buckling under its own weight on a steep jungle slope.
• The logged forest sanctuary: Groundbreaking aerial nest surveys proved that Bornean orangutans do not just survive in untouched primary forest. They can maintain healthy population densities in repeatedly logged woodlands like the Ulu Segama and Malua reserves. These findings helped conservationists recognise how much wildlife recovering forests can support.
• The dipterocarp waiting game: To outsmart seed-eating insects, the giant canopy trees of Borneo coordinate their reproduction. They drop millions of seeds simultaneously in massive unpredictable mast fruiting events designed to overwhelm and satiate predators.
• The insurance policy of biodiversity: Across a 500-hectare experimental site researchers planted 16 different species of dipterocarps in various combinations. They found that diverse mixtures act as ecological insurance because species with dense wood survive droughts while lighter-wood species grow rapidly.
• Carnivore coexistence: Camera trap data from Danum Valley revealed that carnivores like the clouded leopard and the Malayan sun bear share the same hunting grounds by keeping to distinct active hours.
• The drought paradox: Standard restoration practice involves cutting invasive liana vines to stop them strangling young trees. Long-term monitoring revealed that during extreme climate-induced El Niño drought events, the shade from the liana canopy actually reduces soil moisture evaporation and increases seedling survival rates.
• The unstratified canopy: Challenging the classic textbook illustration of neatly layered rainforests, satellite lasers aboard the International Space Station revealed that the vast majority of tropical forests lack distinct multi-level canopy strata.

Ask about the Study Centre

The forests surrounding the untouched core, particularly the Ulu Segama Forest Reserve, suffered extensive selective logging during the 1980s. To mitigate this degradation, the Innoprise-FACE Foundation Rainforest Rehabilitation Project began in 1992. Known as INFAPRO, it represents one of the longest-running tropical forest restoration projects on earth. The project is a partnership between Yayasan Sabah and the Netherlands-based FACE Foundation. It operates across a designated 25,000-hectare target area and has successfully rehabilitated approximately 11,864 hectares to date.

Logging preferentially removed the towering climax trees of the dipterocarpaceae family. Left alone, the forest matrix becomes choked by fast-growing climbing lianas and pioneer shrubs that suppress natural tree regeneration. INFAPRO counters this by deploying teams to cut back the lianas and manually plant nursery-reared dipterocarp seedlings and native fruit trees along carefully cut 2-metre lines.

This active enrichment planting has profound ecological and economic impacts. Research published in Science quantified the exact value of the human intervention. While degraded forests left to regenerate naturally accumulate above-ground carbon at a rate of 2.9 tonnes per hectare per year, active planting accelerates that recovery by 50 percent to 4.4 tonnes. This peer-reviewed validation of carbon additionality allows INFAPRO to issue highly rated carbon credits on the voluntary market. The project has issued over 1 million Verified Carbon Units under Verra's Verified Carbon Standard to fund continued forest repair.

Check dates at Borneo Rainforest Lodge

Visiting Danum Valley brings you into a forest where scientists are still discovering how it works. Permits are arranged with the stay. Travel and health insurance is advised for any visit to Danum Valley and cover that includes emergency evacuation is sensible in a place this remote.

If you stay at the Danum Valley Study Centre, you are inside the working research station. You share the cafeteria with resident scientists and visiting academics. If you arrange an early morning drive to the sunrise viewpoint, you will see the Bukit Atur atmospheric tower rising above the mist. On the trails you will walk past primary forest trees tagged for the ForestGEO plot.

If you choose Borneo Rainforest Lodge, its canopy walkway brings you closer to the forest the scientists study. The lodge's canopy walkway puts you up in the stratum where the mast fruiting events occur and where the scientific discoveries regarding canopy structure were made. The lodge's construction and expansion project runs from 1 January 2025 to 22 January 2027 and adds 9 chalets. At the INFAPRO site in the Ulu Segama forest you can visit the nurseries and see how planting native trees helps the forest recover its carbon.

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