Deforestation · 10 km around the city · 2001–2025
Deforestation around Mariehamn
Since 2001, the area within 10 km of Mariehamn has lost about 3,340 hectares of forest (about 4,700 football pitches): 27% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 243 hectares (7.3%) was deforestation: forest cleared for good for farms, mines or towns.
- Forest in 2000
- 12,600 hawithin 10 km of the centre
- Forest lost since 2001
- 3,340 ha27% of it, about 4,700 football pitches
- Cleared for good
- 243 hadeforestation, 7.3% of the loss
- Worst year
- 2019493 ha lost
Satellite timelapse
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km north-west of the city centre.
Satellite photos of the same 5 × 5 km area, one per year, all taken in the same season so the colours compare. You can see forest being cleared and towns spreading, though not single trees. Download the before/after image (free to reuse with credit to Airleaf).
Year by year
Forest lost around Mariehamn, year by year
Forest loss has stayed about the same: about 172 hectares a year in 2021–2025, against 206 hectares a year in 2016–2020. The worst year was 2019, when about 493 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 10 ha | 55 ha | 64 ha |
| 2002 | 7 ha | 46 ha | 53 ha |
| 2003 | 8 ha | 46 ha | 54 ha |
| 2004 | 7 ha | 159 ha | 166 ha |
| 2005 | 20 ha | 109 ha | 129 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | 46 ha | 46 ha |
| 2008 | 20 ha | 232 ha | 252 ha |
| 2009 | 5 ha | 88 ha | 92 ha |
| 2010 | 20 ha | 71 ha | 91 ha |
| 2011 | 13 ha | 71 ha | 84 ha |
| 2012 | 17 ha | 105 ha | 122 ha |
| 2013 | 9 ha | 80 ha | 89 ha |
| 2014 | 5 ha | 76 ha | 81 ha |
| 2015 | 2 ha | 122 ha | 124 ha |
| 2016 | 22 ha | 89 ha | 111 ha |
| 2017 | 5 ha | 160 ha | 165 ha |
| 2018 | 12 ha | 129 ha | 141 ha |
| 2019 | 12 ha | 481 ha | 493 ha |
| 2020 | 8 ha | 111 ha | 119 ha |
| 2021 | 11 ha | 246 ha | 257 ha |
| 2022 | 11 ha | 183 ha | 194 ha |
| 2023 | 6 ha | 193 ha | 199 ha |
| 2024 | 5 ha | 109 ha | 114 ha |
| 2025 | 9 ha | 88 ha | 98 ha |
Forest gained and lost, 2000–2020
- Forest in 2000
- 11,400 ha
- Forest in 2020
- 10,300 ha
- Overall change
- −1,110 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Mariehamn shrank from about 11,400 hectares to 10,300 hectares, a net loss of about 1,110 hectares (−9.7%). New forest grew on about 357 hectares, but 1,460 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
Causes
What is causing deforestation around Mariehamn?
- 7.3%cleared for good (deforestation)
- 93%can grow back (fire, logging, storms)
- Logging93% · 3,090 ha
Can grow back. Trees cut for timber or paper. The land usually stays forest and grows back.
- Towns and roads6.3% · 211 ha
Cleared for good. Forest replaced by houses, buildings and roads.
Also, each under 1%: farms, pasture and plantations, wildfires, mining and energy, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Nearby cities losing forest
| City | Forest lost (10 km) | Share of its forest | Cleared for good |
|---|---|---|---|
| Stockholm, Sweden | 430 ha | 3.5% | 280 ha |
| Helsinki, Finland | 500 ha | 7.8% | 473 ha |
| Tallinn, Estonia | 972 ha | 12% | 581 ha |
| Riga, Latvia | 1,030 ha | 11% | 280 ha |
| Oslo, Norway | 672 ha | 4.8% | 212 ha |
| Saint Petersburg, Russia | 324 ha | 7.8% | 312 ha |
Use this data
Put Mariehamn's forest loss on your site
Free to embed, with a link back to the full figures.
Frequently asked
Questions about deforestation around Mariehamn
How much forest has Mariehamn lost since 2001?
Since 2001, the area within 10 km of Mariehamn has lost about 3,340 hectares of forest (about 4,700 football pitches): 27% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 243 hectares (7.3%) was deforestation: forest cleared for good for farms, mines or towns.
Is deforestation around Mariehamn getting worse?
Forest loss has stayed about the same: about 172 hectares a year in 2021–2025, against 206 hectares a year in 2016–2020. These are five-year averages from 2011 on, the years the satellite maps were all made the same way.
What is causing deforestation around Mariehamn?
The main causes of forest loss since 2001 are logging (93%), towns and roads (6.3%), farms, pasture and plantations (under 1%). About 243 hectares was deforestation, meaning forest cleared for good for farms, mines or towns. Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
What was the worst year for forest loss around Mariehamn?
The worst year was 2019, when about 493 hectares of forest were lost.
Is the forest around Mariehamn growing or shrinking?
Comparing satellite maps from 2000 and 2020, the forest around Mariehamn shrank from about 11,400 hectares to 10,300 hectares, a net loss of about 1,110 hectares (−9.7%). New forest grew on about 357 hectares, but 1,460 hectares were lost. These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
Can I see satellite images of Mariehamn over the years?
Yes. The timelapse at the top of this page has a satellite photo for every year from 2017 to 2026 of a 5 × 5 km area near Mariehamn, where the most forest was lost. Press play to watch it change, or turn on "Show cleared forest" to see exactly where trees were lost.
How is forest loss measured?
We use satellite maps from the University of Maryland (Hansen and colleagues) that show, for every 30 × 30 m patch of land on Earth, the year its trees were cut down, burned or died, from 2001 to 2025. We add up those patches within 10 km of the centre of Mariehamn, counting only places that were at least 30% covered by trees in 2000. The cause of each loss comes from a map made by the World Resources Institute and Google DeepMind. All figures are estimates.