Söderfjärden, a meteor crater valley, is located approximately 10 kilometers south of the city centre. It is a vast, circular valley area, partially located in the municipality of Korsholm and was formed roughly 520 million years ago, when a celestial body impacted the area. The meteor created a large circular crater with a diameter of stretching over five kilometers. Plants found here include meadowsweet and fireweed, which light up the ditch edges with their pink-red colors when they blossom in July and August. The Sundom village is located north of the Söderfjärden farmlands. The Meteoria Visitation Center, with an exhibition on the unique history of this landscape and surrounding nature, is located in the middle of Söderfjärden. There is also an observation tower and parking lot. Five additional parking spots for bird watchers can be found on Söderfjärden roadsides.

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