Marella fire, January 2026 Passaya, Sandenia, Marella
The fire started on 25 January 2026 in Marella, Guinea, and satellites saw it burning for 8 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,449 hectares from heat detections, spread across 3 municipalities.
It is the 56th largest in Faranah since 2016 (of 208 with a page). Number 76 in Guinea in 2026, of 269.
The power measured by the satellite is low (18.3 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Compare with…
- Burnt area
- 3,449ha
- GWIS perimeter (Copernicus)
- Duration
- 8days
- 25 Jan 2026 – 1 Feb 2026
- Municipalities hit
- 3
- sub-prefectures
- Started on
- 25 Jan
- 2026
- Heat detections
- 45
- in a single hotspot: 18 MW
- Danger at start
- 41
- Very high · FWI index
- Average daily power
- 34MW
- detected power per day, on average
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone 19 days without rain (1 mm or more) when it started.
This area had burned before
84% of the perimeter overlaps earlier fires recorded since 2016: 129 ha in 2016, 1,217 ha in 2017, 716 ha in 2019, 2,548 ha in 2020. Part of it burned more than once, so the yearly figures add up to more than the 2,900 ha that had burned before.
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
-
2,005 ha reached on 26 Jan0.7 %
-
1,120 ha reached on 28 Jan1.1 %
-
Marella where it started345 ha reached on 24 Jan0.5 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre 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) |
|---|---|---|---|---|---|
| 25 Jan | 29.5 °C | 17 % | 40 km/h | 0.0 mm | Very high 41 |
| 26 Jan | 30.7 °C | 17 % | 36 km/h | 0.0 mm | Very high 39 |
| 27 Jan | 31.3 °C | 15 % | 33 km/h | 0.0 mm | Very high 39 |
| 28 Jan | 31.2 °C | 14 % | 27 km/h | 0.0 mm | High 37 |
| 29 Jan | 32.0 °C | 13 % | 27 km/h | 0.0 mm | Very high 38 |
| 30 Jan | 32.9 °C | 16 % | 28 km/h | 0.0 mm | Very high 39 |
| 31 Jan | 33.1 °C | 15 % | 27 km/h | 0.0 mm | Very high 40 |
| 1 Feb | 32.4 °C | 21 % | 24 km/h | 0.0 mm | Very high 39 |
| 2 Feb after | 34.4 °C | 17 % | 23 km/h | 0.0 mm | Very high 40 |
| 3 Feb after | 32.7 °C | 19 % | 28 km/h | 0.0 mm | Very high 42 |
| 4 Feb after | 27.2 °C | 40 % | 30 km/h | 0.7 mm | High 26 |
| 5 Feb after | 32.6 °C | 19 % | 39 km/h | 0.0 mm | Very high 40 |
| 6 Feb after | 33.0 °C | 15 % | 43 km/h | 0.0 mm | Very high 45 |
| 7 Feb after | 33.7 °C | 11 % | 35 km/h | 0.0 mm | Very high 47 |
| 8 Feb after | 33.4 °C | 9 % | 29 km/h | 0.0 mm | Very high 45 |
| 9 Feb after | 32.5 °C | 9 % | 38 km/h | 0.0 mm | Very high 50 |
| 10 Feb after | 33.4 °C | 11 % | 27 km/h | 0.0 mm | Very high 44 |
| 11 Feb after | 33.3 °C | 16 % | 26 km/h | 0.0 mm | Very high 48 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 28 January 2026 the air beside the fire reached 58 µg/m³ of PM2.5. That day averaged 45: 3.0 times the WHO daily guideline (15).
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 · 45Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Marella fire last?
- GWIS (Copernicus) dates it between 25 January 2026 and 1 February 2026: 8 days between the first and last heat detection of the perimeter.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,449 hectares (34.5 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Passaya (2,005 ha, 0.7 %); Sandenia (1,120 ha, 1.1 %); Marella (345 ha, 0.5 %).
- What was the weather like?
- During the fire the temperature reached 33.1 °C, humidity dropped to 13 % and gusts hit 40 km/h. The fire danger index (FWI) reached 41, class Very high.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Guinea (geoBoundaries). 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
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 from the perimeter: the VIIRS detections inside it did not change them. 45 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 ADM3 (Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO)). 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.