Burned area
satellite only1,067ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 21 Aug 2025 – 25 Aug 2025
+− cross-check
No official record is matched to this page to compare it with.
CG · Republic of the Congo · –
Mayama fire, 21 August 2025 Mayama
Out · last detection 22 Aug 2025, 00:32 UTC
The fire started on 21 August 2025 in Mayama, Republic of the Congo, and satellites saw it burning for 5 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,067 hectares from heat detections, spread across a single municipality.
Number 66 in Republic of the Congo in 2025, of 73.
GWIS near-real-time perimeter, from the layer that changed in August 2025: this fire is not compared with fires from earlier years, because since then the GWIS layer gives more and larger perimeters.
The power measured by the satellite is low (9.2 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Use this data
Compare with…
Use this data
Fire page data · version 2026-11-05matches the official recordwith caveatssatellite onlymodel
When copying, the sentence is
Tick the figures you want: they make up the lede and the CSV.
Duration by satellite
satellite only5days
21 Aug 2025 to 25 Aug 2025: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 22 Aug 2025, 00:32 UTC
+− cross-check
Satellites pass a few times a day and cloud or smoke can hide the fire: a lack of detections is not an official extinction. Each country’s emergency service declares a fire contained or out.
Start
satellite only21 Aug 2025
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 21 Aug 2025
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only27
VIIRS detections at 375 m. Most intense hotspot: 9 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 21 Aug 2025 – 25 Aug 2025
+− cross-check
There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.
The worst day
satellite only74MW
Total radiative power on 21 August 2025; hotspots that day: 25.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 21 Aug 2025
+− cross-check
Fire radiative power (FRP) measures the energy the fire gives off when the satellite passes. Added up by day, it compares intensity, not area.
Danger at the start
model11.5FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 25.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 21 Aug 2025, local noon
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
This is an index computed from weather model data, not a measurement of the fire nor an official warning. Danger warnings are issued by each country’s authority. Emergency number and official warnings
Weather during the fire
model28.2°C · 52% RH
High of 28.2 °C and minimum humidity of 52% on 25 August 2025; gusts of 35 km/h on 23 August 2025.
- Source
- weather model at the fire’s grid cell
- Date
- 21 Aug 2025 – 25 Aug 2025
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
These are model values for a cell of about 25 km, not from a weather station: they may differ from what was measured on the ground.
This page’s change log has been kept since 24 October 2026: every night what it publishes is compared and the difference is logged. Anything earlier is reconstructed from each source’s date and marked as reconstructed.
Show
-
logName: Mvouti → Mayama.
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
logLast day with fire: 22 August 2025 → 25 August 2025.
Area logged each night
Move the slider to see which area the page published each day.
Versioned permanent link
https://worldfires.org/en/fire/mayama-2025-08-7?v=2026-11-05A version keeps the area, dates, name and official record; the area as it was logged (changes under 2% are not logged). The map, hotspots and weather always show today’s data.
Citation
A lede of about 60 words figures only, no adjectives
CSV for this fire mayama-2025-08-7.csv · daily, no individual hotspots
| fecha | focos_viirs | frp_mw | tmax_c | tmin_c | hr_min_pct | viento_max_kmh | racha_max_kmh | precip_mm | fwi | clase_fwi | dentro_del_incendio |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025-08-21 | 25 | 74 | 24.3 | 18.1 | 66 | 14 | 29.9 | 0.6 | 11.5 | moderado | 1 |
| 2025-08-22 | 2 | 3 | 24.3 | 17.2 | 58 | 14.4 | 31 | 0 | 13.5 | moderado | 1 |
| 2025-08-23 | 0 | 0 | 25.7 | 16.7 | 53 | 15.7 | 34.6 | 0 | 16.1 | moderado | 1 |
| 2025-08-24 | 0 | 0 | 24.7 | 15.7 | 55 | 13.5 | 32.4 | 0 | 15.3 | moderado | 1 |
| 2025-08-25 | 0 | 0 | 28.2 | 15.7 | 52 | 12.5 | 29.9 | 0 | 16.3 | moderado | 1 |
| 2025-08-26 | 0 | 0 | 27.3 | 18.3 | 58 | 12.7 | 29.2 | 0.1 | 16.6 | moderado | 0 |
| 2025-08-27 | 0 | 0 | 27.7 | 18.5 | 55 | 11.8 | 28.8 | 0 | 16.4 | moderado | 0 |
| 2025-08-28 | 0 | 0 | 27.9 | 18.2 | 56 | 11.2 | 26.6 | 0.6 | 14.5 | moderado | 0 |
| 2025-08-29 | 0 | 0 | 27.7 | 18.3 | 52 | 13 | 31.7 | 0 | 16.8 | moderado | 0 |
| 2025-08-30 | 0 | 0 | 26.3 | 19.3 | 56 | 12.2 | 28.1 | 0 | 16.7 | moderado | 0 |
| 2025-08-31 | 0 | 0 | 25.5 | 17.6 | 61 | 10.5 | 24.5 | 0.3 | 15.7 | moderado | 0 |
| 2025-09-01 | 0 | 0 | 28.6 | 17.5 | 55 | 9.5 | 22 | 0 | 15.5 | moderado | 0 |
| 2025-09-02 | 0 | 0 | 27 | 19.7 | 62 | 12.5 | 26.6 | 0.2 | 16.8 | moderado | 0 |
| 2025-09-03 | 0 | 0 | 25.7 | 19.3 | 61 | 15.9 | 34.9 | 0.3 | 18.6 | moderado | 0 |
| 2025-09-04 | 0 | 0 | 27.5 | 17.7 | 53 | 11.8 | 25.6 | 0 | 17 | moderado | 0 |
It is generated in your browser from this page’s data: one file per fire, aggregated by day and without individual hotspots.
Live widget for your story
It updates itself while the fire is still active and links to this page. Free, with the attribution shown at the bottom.
Sources for this page: GWIS (Copernicus), NASA FIRMS (VIIRS), ERA5 (ECMWF/Copernicus C3S) · Open-Meteo.com (CC BY 4.0). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 1,067ha
- GWIS perimeter (Copernicus)
- Duration
- 5days
- 21 Aug 2025 – 25 Aug 2025
- Municipalities hit
- 1
- districts
- Started on
- 21 Aug
- 2025
- Heat detections
- 27
- in a single hotspot: 9 MW
- Danger at start
- 12
- Moderate · FWI index
- Average daily power
- 38MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
21 Aug25 Aug
22 Aug 2025
How it evolved, day by day
21 Aug
22 Aug
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
28°high
35km/h · peak gust
52%lowest humidity
It had gone 25 days without rain (1 mm or more) when it started.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Mayama where it started1,074 ha reached on 21 Aug0.1 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance runs from the point marking the centre of each area to the nearest fire: staying a kilometre away does not mean it reached the houses.
The weather day by day
ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.
Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 21 Aug | 24.3 °C | 66 % | 30 km/h | 0.6 mm | Moderate 12 |
| 22 Aug | 24.3 °C | 58 % | 31 km/h | 0.0 mm | Moderate 14 |
| 23 Aug | 25.7 °C | 53 % | 35 km/h | 0.0 mm | Moderate 16 |
| 24 Aug | 24.7 °C | 55 % | 32 km/h | 0.0 mm | Moderate 15 |
| 25 Aug | 28.2 °C | 52 % | 30 km/h | 0.0 mm | Moderate 16 |
| 26 Aug after | 27.3 °C | 58 % | 29 km/h | 0.1 mm | Moderate 17 |
| 27 Aug after | 27.7 °C | 55 % | 29 km/h | 0.0 mm | Moderate 16 |
| 28 Aug after | 27.9 °C | 56 % | 27 km/h | 0.6 mm | Moderate 14 |
| 29 Aug after | 27.7 °C | 52 % | 32 km/h | 0.0 mm | Moderate 17 |
| 30 Aug after | 26.3 °C | 56 % | 28 km/h | 0.0 mm | Moderate 17 |
| 31 Aug after | 25.5 °C | 61 % | 24 km/h | 0.3 mm | Moderate 16 |
| 1 Sept after | 28.6 °C | 55 % | 22 km/h | 0.0 mm | Moderate 16 |
| 2 Sept after | 27.0 °C | 62 % | 27 km/h | 0.2 mm | Moderate 17 |
| 3 Sept after | 25.7 °C | 61 % | 35 km/h | 0.3 mm | Moderate 19 |
| 4 Sept after | 27.5 °C | 53 % | 26 km/h | 0.0 mm | Moderate 17 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 14 Aug 2025
After · 1 Sept 2025
Sentinel-2 did not pass over on that day. Try another date, or use false colour, which is daily.
If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.
The smoke
CAMS · CopernicusOn 19 August 2025 the air beside the fire reached 64 µg/m³ of PM2.5. That day averaged 46: 3.1 times the WHO daily guideline (15).
PM2.5 peak64 µg/m³
Days over the guideline7 days
PM1066 µg/m³
Optical depth1.11
WHO 15
19 Aug21 Aug23 Aug25 Aug
Good
Fair
Moderate
Poor
Very poor
Extremely poor
Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.
Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)
Detections table · 27Every satellite heat detection, one by one, with time, satellite, power and coordinates.
⬇ Download CSV
Times in UTC. Each detection is a 375 m pixel: a large fire yields hundreds per pass.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 2,084 haBrazzaville18 July 2026 · 6 days · 14 km away
- 1,853 haMayama19 June 2022 · 4 days · 14 km away
- 1,714 haBrazzavilleJuly 2017 · 10 days · 19 km away
- 2,061 haMayama16 August 2025 · 3 days · 25 km away
- 1,608 haBrazzavilleAugust 2026 · 6 days · 27 km away
- 1,567 haMayama5 March 2018 · 8 days · 31 km away
Frequently asked questions
- How long did the Mayama fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 21 August 2025 to 25 August 2025 (5 days). The perimeter dates it from 21 August 2025 to 22 August 2025.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 1,067 hectares (10.7 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Mayama (1,074 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 28.2 °C, humidity dropped to 52 % and gusts hit 35 km/h. The fire danger index (FWI) reached 16, class Moderate.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Republic of the Congo (geoBoundaries ADM2). It is not an official report.
Where to verify it
A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.
Satellite cross-check
History of this page · 2 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Name: Mvouti → Mayama.
- Last day with fire: 22 August 2025 → 25 August 2025.
RSS Changes to this page With cross-checks and a citable version
Does something look wrong on this page?
This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.
Report an error
How we know this
- Perimeter: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 21 August 2025 to 22 August 2025. 27 Suomi-NPP VIIRS detections on those dates.
- We have not matched this page with any official record.
- Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
Where this data comes from
The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Map Library 2007, nombres de Wikidata) (Public Domain). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.