Peatland fires begin when an ignition source reaches peat that has dried enough to burn, usually after drought, drainage or a lowered water table. They are exceptionally difficult to extinguish because much of the fire can smoulder without visible flames beneath the ground. A surface hose line may cool the top while heat and combustion remain deeper in the peat, allowing the fire to continue for weeks or months and to rekindle later.
Peat fires are therefore a problem of both ignition and landscape condition: a spark or flame starts the event, but dry organic soil, oxygen pathways and sustained heat determine whether it spreads. Effective suppression has to cool or isolate the underground combustion zone, not merely wet the visible surface.
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Why naturally wet peat usually resists fire
Peat is fuel with a high moisture barrier
Peat consists of layers of partially decomposed plants accumulated over long periods in waterlogged conditions. When the pore spaces are full of water, heat is absorbed in evaporating that moisture and oxygen has less opportunity to move through the material. Saturated peat is consequently hard to ignite and harder to keep burning than dry vegetation.
Drought and drainage change the risk
Prolonged drought removes water from the upper peat. Drainage ditches, canals and other land-use changes can lower the water table, leaving an aerated layer above it. That layer contains organic fuel, available oxygen and less water to carry heat away. Forest Research lists dry organic soils and exposure to ignition as wildfire-risk conditions (Forest Research).
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Human activity is an important source of drying and ignition in some regions, including parts of Southeast Asia, but no single activity explains every peat fire. Lightning, escaped land-management fires, machinery, discarded cigarettes and other human or natural ignition sources can all matter depending on the place and event. The cause of ignition must be distinguished from the conditions that let a fire persist.
How an ignition turns into an underground smouldering fire
Ignition is only the first step
A flame or hot object may ignite the surface, but continued spread requires peat that is dry enough to sustain combustion. Once a heated pocket forms, the reaction can move from flaming at the surface to smouldering inside the soil. Smouldering is a flameless reaction in solid fuel: it releases heat more slowly and at lower temperatures than a flame, yet it can remain active for a very long time.
The active front can be hidden
Porous peat permits some oxygen movement below ground. The smouldering front heats, dries and preheats adjacent peat, allowing the zone to advance sideways or downward. Surface flames may disappear while the hottest material is buried. Smoke can vent through cracks or soft ground, but its absence does not prove that the fire is out.
Natural Resources Canada describes smouldering ground fires as burning slowly in deep organic layers and being difficult to extinguish (Natural Resources Canada). Forest Research similarly warns that “Smouldering peat fires are hard to extinguish and can re-kindle frequently” (Forest Research).
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Slow spread does not mean minor damage
A smouldering front may advance far more slowly than a flaming crown or grass fire, but it can keep consuming the soil for weeks or months. Because peat is itself an ecosystem substrate, combustion damages roots, seeds, fungi and other below-ground life as it moves. In the 2022 GAMBUT field experiment on a degraded Sumatran peatland, lethal fire severity to the peat biological system was observed to a depth of up to 30 centimetres. That depth describes the experiment, not a universal maximum for peat fires.
Why putting a peat fire out is unusually difficult
Surface indicators understate the fire’s size
Flames and smoke show only where heat and gases reach the surface. The burning layer may extend beyond those signs, separated from firefighters by an insulating layer of peat. A crew can therefore declare a visible edge cool while a buried section remains hot enough to restart combustion.
Water may stop short of the hot layer
Water suppresses smouldering by removing heat and increasing moisture until the reaction cannot sustain itself. On uneven, fibrous peat, however, water can flow around dry pockets, drain away through channels or evaporate before reaching the deepest hotspot. The amount that appears to soak in at the surface is not a reliable measure of how much cooling occurred at depth.
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Partial wetting may lower temperatures temporarily without eliminating every active ember-like zone. As the site dries, oxygen and heat can support renewed smouldering. This is why suppression is a landscape operation that includes checking for rekindling, not a single pass of a hose or tanker.
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Field observations show the scale of the challenge
The GAMBUT experiment recorded a critical water-column height below which extinction was not possible under its test conditions. It also found that deep smouldering temperature was 13% hotter than the shallow layer during daytime. These measurements came from one field experiment in Sumatra and should not be treated as universal thresholds for other peat types, climates or fire sizes.
Suppression methods and what each one can—and cannot—do
Operational choices depend on peat depth, fire extent, water supply, terrain, access and the risk of damaging nearby wetlands. The methods below are not interchangeable, and the available evidence ranges from field operations to controlled laboratory work.
| Method | Primary action and subsurface reach | Requirements | Important limits | Evidence context |
|---|---|---|---|---|
| Surface water spray | Cools and wets the upper peat; can reach deeper layers only when enough water infiltrates. | Reliable pumps, delivery lines, repeated application and access for crews. | Runoff or uneven infiltration can leave buried hotspots; large areas require sustained supply. | Used in field suppression and studied experimentally. |
| Water injection | Places water closer to the underground combustion zone than a surface spray. | Injection equipment, suitable ground and operators able to locate or target hot zones. | Equipment may not reach every pocket, and fractured or deep peat can divert flow. | Included among methods reviewed in the 2021 literature. |
| Reflooding or rewetting | Raises the water level across a larger area, cooling peat and limiting oxygen access. | Large water volumes, control structures and infrastructure that can hold water. | Slow to establish, difficult during drought and potentially disruptive to surrounding land. | Documented as a landscape-scale approach. |
| Peat removal and trenches | Removes fuel or creates a gap intended to stop lateral spread. | Excavators or other heavy machinery and enough space for a continuous barrier. | Deep trenches are difficult to dig in wet or remote ground and can alter hydrology. | Used or studied as a firebreak method. |
| Compaction | Compresses peat, reducing pore space and oxygen movement. | Suitable heavy machinery, stable access routes and repeated passes where needed. | Machinery access may be impossible; compaction can damage the wetland and does not remove heat by itself. | Reviewed as a possible suppression technique. |
| Ice, dry ice or liquid nitrogen | Rapidly cools the fuel; some agents also displace air locally. | Specialist materials, transport and controlled handling. | Short-term cooling may be followed by temperature rebound; field logistics and environmental effects are unresolved. | Compared in controlled laboratory tests published in 2026, not validated as general field tactics. |
| Buried heat-pipe firebreak concept | Attempts to draw heat away or create an underground barrier around a fire. | Installation of engineered heat-pipe systems below the surface. | New concept with no broad operational proof; performance depends on design and site conditions. | Proposed and tested in controlled experiments in 2026. |
What the water studies actually establish
Rainfall intensity is not a universal prescription
A 2021 review cites a laboratory rainfall experiment in which water application of 4 millimetres per hour for at least five hours was needed to suppress smouldering under that study’s setup (International Journal of Wildland Fire). The result describes a particular fuel arrangement, moisture condition and laboratory system. It is not a field rule that every peat fire can be extinguished by applying that rate for that duration.
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The Sumatran field experiment’s critical water-column observation demonstrates why delivery conditions matter: a nominal volume cannot be separated from how high water stands, where it infiltrates and whether it remains long enough to cool the burning layer. Peat depth, density, channels and the shape of the fire all change the outcome. No single universal water quantity is established by the available studies.
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Cooling-agent comparisons remain experimental
A 2026 laboratory study compared water, ice, dry ice and liquid nitrogen. In its controlled tests on air-dried peat at about 10% moisture, it reported a minimum of 41 kilograms of dry ice per square metre and up to 175 minutes of effective cooling; the abstract reported about 90 kilograms of water per square metre for comparable suppression in that condition (Fire Safety Journal). Those quantities are experimental results, not instructions for field crews or the public. The same study found that liquid nitrogen cooled rapidly but could be followed by a temperature rebound, illustrating why a low temperature immediately after treatment does not guarantee extinction.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why verification after suppression is essential
Because smouldering can persist below a cooled crust, response teams must treat extinguishment as a process of reaching, cooling and confirming the subsurface zone. The practical questions are whether water or another treatment reached the active layer, whether enough heat was removed, and whether the area can stay wet or isolated long enough to prevent re-ignition. A surface that looks dark and damp answers none of those questions by itself.
Monitoring also has to account for fire spread beyond the visible perimeter. Heat can migrate through connected peat, roots or dry layers, so a trench, compacted strip or wetted area that is too narrow may be bypassed. The appropriate inspection interval and equipment depend on local agencies, fire size and terrain; the studies do not provide one universal field checklist.
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Protect the water table
Maintaining high water levels limits the dry, oxygenated layer in which smouldering can start. Rewetting projects and canal blocking have been adopted in some regions, but they require substantial labour, construction and ongoing management. During an extended drought, even a restored system may fall below a safe moisture level, so hydrological work reduces risk rather than guaranteeing that fire cannot occur.
Manage ignition exposure
Restricting open burning, controlling hot machinery and improving access rules near dry peat can reduce the number of opportunities for ignition. Prevention must be tailored to local practices because the sources of sparks and flames differ between agricultural, industrial, recreational and remote landscapes.
Plan for drought conditions
Fire danger rises when rainfall deficits persist and the water table drops. Agencies and land managers can use those conditions to increase patrols, enforce burning restrictions and stage equipment before an ignition occurs. Such measures address the combination of a possible spark and unusually receptive fuel, rather than assuming that any one ignition source explains the whole risk.
The practical bottom line
Peatland fires are hard to put out because the main fire may be a slow, oxygen-fed reaction inside the soil. Drying from drought or drainage makes peat combustible; smouldering then preheats and dries neighbouring layers while remaining largely hidden. Suppression succeeds only when treatment reaches the burning depth, removes enough heat or fuel, and prevents the site from drying and rekindling. Water, reflooding, trenches and compaction each have logistical and environmental constraints, while cryogenic agents and buried heat pipes remain experimental. Keeping peat wet and limiting ignition exposure is usually more reliable than trying to fight a large underground fire after it has formed.
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