Most of these islands were designated as the Bothnian National Marine Park by the Finnish government in 2011. Since then, it has consistently been a popular tourist destination.

Bothnian Marine Park was established to protect both the marine environment and the nesting areas of migratory birds. Every June, flocks of birds fill the park's skies: perching geese, rose-footed geese, white-cheeked black geese, great swans, white swans, black grouse, European doves, and more. On Leveäkari Island, there is an observation tower that welcomes hundreds of visitors each year for birdwatching.
The best time to see the birds nesting and laying eggs is from April to June. During this time, many tourists also rent kayaks to travel between the islands. Some are so engrossed in watching the flocks of birds that they forget to paddle.
Scuba diving is a popular activity for visitors to Bothnian Park. The waters around Preiviikinlahti Bay are ideal for visitors with little diving experience who still want to learn about the underwater grassland ecosystem of the Baltic Sea. Visitors can also freely fish.
Every winter, locals and tourists alike flock to the frozen sea to fish or ice skate. Tourists just need to remember that fishing with a hand-held rod is allowed, but if they want to use a professional rod and bait, they must pay a fee in advance to the park management.
When discussing man-made structures in Bothnian Park, one must mention the two lighthouses on the islands of Kylmäpihlaja and Isokari. The Isokari lighthouse is still operational, while the Kylmäpihlaja lighthouse has been renovated into a restaurant and hotel. Both retain many historical features from the heyday of the Grand Duchy of Finland (19th century). Additionally, there is a small wooden chapel nestled in the forest on Putsaari Island.
Legend has it that the chapel was built by Franciscan friars from Rauma. Many visitors, after visiting the chapel, often have picnics in the forest. Visitors are allowed to pick strawberries and mushrooms, but absolutely must not touch any other plants. Cooking fires is only permitted at designated campsites.
Source: https://hanoimoi.vn/kham-pha-cong-vien-bien-bothnian-659130.html






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