Tragedy in the Peatlands: Devastating Wildfires Threaten Endangered Proboscis Monkeys in South Kalimantan

South Kalimantan, Indonesia — Unrelenting forest and land fires (kebakaran hutan dan lahan or karhutla) sweeping across South Kalimantan have evolved from an ecological emergency into a profound wildlife conservation tragedy. Amid thousands of hotspots suffocating the province, a devastating human-wildlife collision unfolded in Balimau Village, Kalumpang Subdistrict, Hulu Sungai Selatan (HSS) Regency, claiming the lives of at least 11 proboscis monkeys (Nasalis larvatus).

The endangered primates, a species endemic to the island of Borneo and strictly protected under international and Indonesian conservation laws, became trapped and perished as walls of flames tore through their fragile peat swamp habitat.

Main Facts: The Human and Ecological Toll

The severity of the 2026 fire season in South Kalimantan has far exceeded manageable thresholds, exposing systemic vulnerabilities in disaster response and wildlife protection. According to data from the Provincial Disaster Management Agency (BPBD), a staggering 3,256 individual fire incidents have been recorded between January and September 15, 2026, scorching an estimated 21,696 hectares of land.

The human-wildlife conflict reached a grim milestone on Sunday, September 13, 2026, in Balimau Village. Local firefighters and residents battling an aggressive peatland fire stumbled upon the charred remains of 11 proboscis monkeys.

"Ten were adults, and one was an infant," confirmed Alamsyah, the Head of Balimau Village, highlighting the immense devastation to a single local troop.

Subsequent assessments by the Natural Resources Conservation Agency (BKSDA) of South Kalimantan revealed that the fires have impacted an even wider array of wildlife. Officials documented casualties and displaced animals, including 12 proboscis monkeys, a reticulated python (Malayopython reticulatus), and a king cobra (Ophiophagus hannah). The affected zones are also vital habitats for maroon langurs (Presbytis frontata) and long-tailed macaques (Macaca fascicularis), whose populations remain under anxious observation.

Chronology of the Disaster: How Balimau Caught Fire

The catastrophe in Balimau Village did not start locally; rather, it arrived on the wings of strong winds and dry vegetation. Alamsyah explained that the fire originated from a hotspot in the neighboring village of Karangpaci, separated from Balimau by a river.

"We never expected the fire to cross over to our village. We were separated by a river," Alamsyah recounted. "Perhaps due to strong winds, kelelatu [airborne burning soot and embers] flew across and ignited the dry vegetation on our side, triggering the blaze."

The fire initially targeted a vast swamp forest dominated by sago palms (Metroxylon sagu), where the vegetation quickly combusted. As local firefighters and villagers rushed to suppress the flames, they inadvertently trapped the resident proboscis monkeys.

Unlike ground-dwelling mammals, proboscis monkeys rely heavily on riparian canopies and exhibit strong avoidance behaviors when encountering humans. Cornered between the advancing wall of fire and the human response teams blocking their escape route, the primates panicked.

"Because proboscis monkeys tend to avoid humans, they grew confused trying to find an escape path. That is likely what caused them to become trapped by the fire and burn to death," Alamsyah said.

Efforts to contain the fires stretched across multiple days. By Tuesday, September 15, at least six active spot fires continued to flare up in Balimau due to drifting embers. Compounding the crisis, local firefighting capabilities were severely strained by drying water sources, forcing the village to rely on portable pumps and emergency assistance—including water tanker trucks—dispatched from the district capital of Kandangan.

Supporting Data: A Broader Crisis Across South Kalimantan

Balimau is not an isolated front. The entire ecosystem of South Kalimantan is gasping for air as overlapping peat fires encroach upon critical animal populations.

In Sungai Rutas Hulu and Sungai Rutas villages (Candi Laras Selatan Subdistrict, Tapin Regency), ferocious fires burned unchecked for days, consuming 10 and 20 hectares of agricultural land and scrub, respectively. Syahrani Sarunang, a local resident, noted that the area serves as home to roughly nine distinct proboscis monkey colonies, with each colony comprising 30 to 35 individuals.

While swift community action managed to protect the monkeys from direct incineration in Sungai Rutas, the long-term prognosis remains grim. The fires destroyed the local vegetation—the primates’ primary food source. Because charred peatland flora takes months to regenerate, the surviving troops face prolonged nutritional stress. Syahrani noted that the current fires evoke harrowing memories of the 1950-2015 mega-fires, which similarly asphyxiated and killed 15 to 20 proboscis monkeys in his village alone due to their acute sensitivity to smoke.

Further south, in the Essential Ecosystem Area (KEE) for proboscis monkeys in Penjaratan Village, Tanah Laut Regency, a brush fire burned perilously close to a habitat supporting 200 to 300 individuals. Fortunately, local intervention extinguished the blaze within a day, averting disaster for that specific population.

Conservation Science: The Silent Killer of Wildfire Smoke

While direct incineration claims lives instantly, scientific literature underscores a more insidious threat: the physiological toll of wildfire smoke on primates.

According to the IUCN Red List, habitat destruction via logging, agriculture, and urban encroachment remains the primary driver of the proboscis monkey’s decline, with wildfires exacerbating fragmentation. Furthermore, a growing body of research highlights the severe latent impacts of smoke inhalation:

• Behavioral Disruption: A study published in Scientific Reports on Bornean gibbons (Hylobates albibarbis) during the 2006 fires revealed that individuals sang significantly less and for shorter durations on heavy haze days.
• Vocal and Health Impairments: Research in iScience detailing the 2015 peat fires noted that orangutans exhibited a marked decrease in vocal frequency and degraded vocal quality, signaling acute physiological stress and respiratory distress.
• Long-Term Health Deficits: Studies from the California National Primate Research Center, focusing on rhesus macaques exposed to high particulate matter (PM2.5) concentrations, demonstrated spikes in miscarriage rates, alongside lifelong pulmonary, immune, and cognitive deficits in surviving offspring.

Official Responses: Protection Gaps Between Reserves and Production Lands

The tragedy has sparked intense debate over jurisdictional responsibilities and the effectiveness of government wildlife protection frameworks during environmental disasters.

Rudiono Herlambang, Head of the Sub-Division for Natural Resources Conservation and Ecosystem Protection at the South Kalimantan Forestry Department (Dishut), maintained that wildlife preservation is inherently embedded within wildfire protocols.

"If a fire occurs in a known protected wildlife habitat, the standard response is to provide an independent evacuation route for the animals," Herlambang stated. He emphasized that the agency coordinates closely with the BKSDA, which operates a designated call center for public wildlife distress reports.

However, Herlambang conceded a glaring structural reality: satellite tracking and ground checks indicate that the vast majority of 2026 hotspots are occurring on Other Land Uses (Areal Penggunaan Lain or APL) and community lands, rather than inside gazetted state forests.

Agus Ngurah, Head of BKSDA South Kalimantan, echoed these operational boundaries. BKSDA possesses comprehensive disaster response mechanisms—including task forces, hotspot monitoring via the SiPongi system, and Wildlife Rescue Units. However, Ngurah admitted that these protocols function effectively almost exclusively within official conservation areas.

Data from BKSDA illustrates the gravity of this jurisdictional gap: out of 3,757 proboscis monkeys mapped across 11 regencies and cities in 2025, only 1,281 individuals reside within the 12 official conservation areas. The remaining 2,476 individuals—roughly two-thirds of the total population—live outside protected zones. They inhabit production forests, protected forests managed by the Forestry Department, and APL zones, where their survival is left exposed to corporate land clearing, community activities, and unmanaged wildfires.

To bridge this gap, Ngurah stated that BKSDA is pushing for collaborative Preservation Area (PA) schemes with local governments to expand safeguards beyond state-designated borders.

Implications: A Call for Systemic Reform

Academic experts argue that current government interventions fall short because they prioritize firefighting over holistic ecosystem management.

Professor Muhammad Arief Soendjoto, a leading Flora and Fauna Conservation expert at Lambung Mangkurat University (ULM), expressed deep anguish over the recurring loss of wildlife. He criticized authorities for treating animal rescue as an afterthought.

"Their habitat has already been heavily logged, and now it’s burning. Aside from the fire itself, the toxic smoke makes it impossible for them to breathe. Where are they supposed to run?" Soendjoto asked rhetorically. "During past wildfire emergencies, I have never seen concrete government efforts to evacuate wildlife. The singular focus is always on putting the fire out. As long as the fire dies, that’s considered enough."

Soendjoto emphasized that true conservation requires proactive prevention rather than reactive suppression. He urged authorities to leverage cultural and religious networks—such as engaging influential Islamic clerics (ulama)—to educate communities against illegal land-clearing practices during dry spells. In a deeply religious region like South Kalimantan, moral appeals from respected spiritual leaders carry immense weight.

Concurrently, strict law enforcement against entities or individuals deliberately setting fires for agricultural or commercial gain remains non-negotiable. Without punitive accountability, cycles of environmental degradation will continue to shrink the living space of Borneo’s iconic wildlife.

For Alamsyah and the residents of Balimau, the loss of the 11 proboscis monkeys serves as a haunting wake-up call. Having petitioned the government for formal habitat protection since 2016 without success, Alamsyah hopes this catastrophe finally forces authorities to act before the remaining troops are wiped out.

"The government shouldn’t only show up after the animals are dead," Alamsyah urged. "They must take preventive action before the fire season arrives. These animals are part of our identity."