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Söderfjärden
Söderfjärden is visible as the hexagonal cultivated area in this Landsat image
Impact crater/structure
Confidence	Confirmed
Diameter	6.6 kilometres (4.1 mi)
Depth	300 metres (980 ft)
Age	640 Ma
Exposed	No
Drilled	Yes
Location
Country	Finland
Municipality	Vaasa

Söderfjärden is a polder in Ostrobothnia, western Finland, 10 kilometres south of the town of Vaasa. The plain is in an impact crater which was made at least some 640 million years ago (Proterozoic, near the end of the Cryogenian). The crater's diameter is 6.6 kilometres (4.1 mi) and its maximum depth is 300 metres (980 ft). It is filled with Cambrian sandstones leaving only the outer rim visible. There is also a central uplift, which is buried. After rising from the sea due to post-glacial rebound, Söderfjärden was a wetland but was later drained with help of a pump station. It is currently cultivated and is clearly visible from air as a large hexagonal field. This makes Söderfjärden unique among the other impact structures in Finland which are at least partially below sea level. The area of the basin is divided half and half between Vaasa and Korsholm, with a small corner belonging to Malax.

See also

• Impact craters in Finland

References

1. "Söderfjärden". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 16 August 2009.
2. "The Many Facets of Söderfjärden". NASA Earth Observatory. 19 September 2024. Retrieved 3 January 2025.

External links

• Sundom village travel information page about Söderfjärden.
• Söderfjärden in Finnish impact structures homepage.
• The homepage of a local exhibition site, called Meteoria, in Swedish, Meteoriihi in Finnish, describing the area. Ria (riihi) is a kind of barn, where crop is dried, and the building looks like one.
• Google Earth view

63°00′18″N 21°34′30″E / 63.00500°N 21.57500°E / 63.00500; 21.57500

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• Earth Impact Database
• Impact craters of Finland
• Proterozoic impact craters
• Landforms of Ostrobothnia (region)
• Polders
• Western Finland Province geography stubs