Gonnosfanadiga fire, July 2017 Arbus, Gonnosfanadiga, Fluminimaggiore
The fire started on 31 July 2017 in Gonnosfanadiga, Italy, and satellites saw it burning for 2 days. Copernicus mapped a burnt perimeter of 2,349 hectares from satellite imagery, spread across 3 municipalities.
It is the largest fire in Sud Sardegna since 2016 (of 37 with a page). Number 5 in Italy in 2017, of 361.
Compare with…
- Burnt area
- 2,349ha
- Copernicus perimeter
- Duration
- 2days
- 31 Jul 2017 – 1 Aug 2017
- Municipalities hit
- 3
- municipalities
- Started on
- 31 Jul
- 2017
- Heat detections
- 93
- in a single hotspot: 113 MW
- Danger at start
- 60
- Extreme · FWI index
- Average daily power
- 1.1GW
- 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 28 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).
Rome boundary: geoBoundaries · ISTAT, National Institute of Statistics (CC BY 3.0).
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).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Arbus 5,722 inhabitants · 3.6 km from the centre2,070 ha reached on 31 Jul7.7 %
-
Gonnosfanadiga where it started256 ha reached on 31 Jul2.0 %
-
Fluminimaggiore 2,639 inhabitants · 4.8 km from the centre22 ha reached on 1 Aug0.2 %
Burnt area inside each municipality, from crossing the official 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.
What burned
- Other natural land59 %
- Agricultural areas30 %
- Sclerophyllous scrub9.7 %
- Broadleaved forest2.0 %
Natura 2000 protected area affected: 0 %
- LIC Capo Pecora ITB040030
- LIC Da Piscinas a Riu Scivu ITB040071
- LIC Monte Linas - Marganai ITB041111
Natura 2000 sites (European Environment Agency, 2024 release) crossed by the perimeter.
Land cover inside the perimeter according to Corine Land Cover, as reported by Copernicus.
People and buildings inside the perimeter
GHSL 2015Inside the perimeter there were about 2.8 hectares of built-up land and almost nobody lived there (GHSL 2015, satellite-based estimate).
This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned.
Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu
Official record
According to CFVA Sardegna, this fire started on 31 July 2017 and burned 2,035 ha (the satellite measured 2,349 ha).
- Arbus P.ta S. Anastasia 31 July 2017 2,035 ha
Regione Autonoma della Sardegna, Corpo Forestale e di Vigilanza Ambientale: perimetri delle aree percorse dal fuoco (CC BY 4.0). This is the agency’s consolidated statistic: it measures the area in its own way, which is why it can differ from the satellite.
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) |
|---|---|---|---|---|---|
| 31 Jul | 35.2 °C | 25 % | 66 km/h | 0.0 mm | Extreme 60 |
| 1 Aug | 36.1 °C | 21 % | 55 km/h | 0.0 mm | Extreme 56 |
| 2 Aug after | 35.4 °C | 22 % | 26 km/h | 0.0 mm | High 38 |
| 3 Aug after | 38.0 °C | 19 % | 31 km/h | 0.0 mm | Very high 44 |
| 4 Aug after | 37.7 °C | 17 % | 39 km/h | 0.0 mm | Extreme 51 |
| 5 Aug after | 33.9 °C | 33 % | 36 km/h | 0.0 mm | Very high 39 |
| 6 Aug after | 33.2 °C | 41 % | 48 km/h | 0.0 mm | High 38 |
| 7 Aug after | 34.1 °C | 30 % | 42 km/h | 0.0 mm | High 38 |
| 8 Aug after | 36.1 °C | 26 % | 36 km/h | 0.0 mm | Very high 42 |
| 9 Aug after | 31.7 °C | 43 % | 32 km/h | 0.0 mm | High 32 |
| 10 Aug after | 27.3 °C | 46 % | 63 km/h | 0.0 mm | Very high 40 |
| 11 Aug after | 25.1 °C | 41 % | 53 km/h | 0.0 mm | High 34 |
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.
Detections table · 93Every 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 Gonnosfanadiga fire last?
- Copernicus dates it between 31 July 2017 and 1 August 2017: 2 days between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 2,349 hectares (23.5 km²). Official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Arbus (2,070 ha, 7.7 %); Gonnosfanadiga (256 ha, 2.0 %); Fluminimaggiore (22 ha, 0.2 %).
- Did the fire reach a town?
- The fire came within 3.6 km of the centre of Arbus, the closest of the areas it touched. That is the distance from the perimeter, or the nearest hotspot, to the point marking the centre; it does not mean it entered the houses.
- What was the weather like?
- During the fire the temperature reached 36.1 °C, humidity dropped to 21 % and gusts hit 66 km/h. The fire danger index (FWI) reached 60, class Extreme.
- Where does this data come from?
- From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Italy (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.
Emergency number: 112 · 1515 · Emergency number and official warnings ›
Satellite cross-check
History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
No changes since 24 October 2026.
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: EFFIS (Copernicus), mapped on satellite imagery.
- Dates from the perimeter: the VIIRS detections inside it did not change them. 93 Suomi-NPP VIIRS detections on those dates.
- Compared with CFVA Sardegna: 2,035 official ha against 2,349 ha of perimeter; they agree within 25%.
- Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
- Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2015, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.
Where this data comes from
The perimeter and land cover come from the Copernicus European Forest Fire Information System (EFFIS), measured on MODIS and Sentinel-2 imagery and published under CC BY 4.0. 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 ADM4 (Creative Commons Attribution 3.0 License). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from each country’s official figure.