Söderfjärden

Key facts

Terrestrial impact site.name: Söderfjärden
Terrestrial impact site.photo: Söderfjärden Landsat.jpg
Terrestrial impact site.photo_caption: Söderfjärden is visible as the hexagonal cultivated area in this Landsat image
Terrestrial impact site.map: Finland
Terrestrial impact site.confidence: Confirmed
Terrestrial impact site.age: 640 Ma
Terrestrial impact site.exposed: No
Terrestrial impact site.drilled: Yes
Terrestrial impact site.country: Finland
Terrestrial impact site.municipality: Vaasa

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Image: Soderfjarden viljapelto.jpg

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Commons category: Söderfjärden
inception: 520000000-

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thumb|250px|View of the basin of the crater remnant from Öjberget, a hill that belongs to the Rim (crater)|crater rim Söderfjärden is a polder in Ostrobothnia, western Finland, 10 kilometres south of the town of Vaasa. The plain is in an impact crater dating back to more than 640 million years ago (Proterozoic, near the end of the Cryogenian). The crater's diameter is and its maximum depth is . 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