When the dry season arrives at Cambodia's Tonle Sap—Southeast Asia's largest freshwater lake—the water recedes and the flooded forest becomes a tinderbox, its exposed mangrove roots turning brittle in the sun. Yet over the past three years, seventy-eight trained community firefighters have responded to satellite wildfire alerts to stop what seemed inevitable: the slow erasure of one of the region's most vital ecosystems. Using a combination of technology and traditional knowledge, residents are not only extinguishing fires but actively healing the forest they depend on for survival.
More than a million people live around Tonle Sap, relying on its waters for fish, shelter, and livelihoods. The flooded forest that surrounds the lake is their lifeline—and it is disappearing. A study by the Wonders of the Mekong project, led by the University of Nevada, found that nearly a third of forests in floodplains like this area were lost between 1993 and 2017. Forest conversion for agriculture accounts for part of the loss, but wildfires have become equally devastating, especially during the dry season when careless cigarettes, unattended campfires, and controlled burns that escape their boundaries can ignite the parched landscape. Farmers burning land to encourage new grass for buffalo can inadvertently spark infernos they cannot control. When fires rage, ash washes into the water, degrading its quality and making it uninhabitable for the hundreds of fish species that depend on these waters.
The Community-Based Fire Management program emerged as a response to this crisis. Seventeen Tonle Sap communities, local authorities, and fishing organizations joined forces, supported by Conservation International, which receives satellite wildfire alerts and forwards them to patrol teams on the ground. The success has been concrete: community firefighters have successfully responded to 50 wildfire alerts, protecting approximately 64,000 hectares—around 158,000 acres—of flooded forest from destruction. These are not distant statistics. Luon Chanleng, a fisher from Tonle Sap, articulates what that protection means: "When the forest [is] healthy, fish can breed and grow. But if the forest burns, the fish disappear — and that affects the livelihoods of our whole community."
Beyond firefighting, communities are actively restoring what has been lost. Residents have opened community nurseries, gathering seeds from native trees and planting close to 270,000 seedlings in gallery forests around the lake. This matters deeply because invasive species threaten natural recovery. Mimosa pigra, a fast-growing South American shrub, colonizes burned areas faster than native plants can reestablish themselves, and when it dries, it becomes additional fuel for future fires. The native species being replanted—including sdey, roteang, ta ou, sandan, and krabao—grow into tall trees that provide critical habitat for waterbirds and mammals.
The impact of these efforts is already visible. Fishing cats, a threatened species, have been spotted for the first time in ten years in the restoration area. The hairy-nosed otter has also returned. What began as a crisis response has become a blueprint for community-led conservation: locals using satellite technology and their own hands to defend not just a forest, but the interconnected web of life—and livelihoods—that depends on it.