Björkö

Björkö is an island in the outer archipelago of Korpo. Byviken, a harbour located on its southern side, is the most popular natural harbour in the southern Archipelago due to its safe harbour and magnificent views. Island can be reached only by boat.
The island's geology is highly varied and can be explored on Björkö's fascinating nature trail which goes around the island´s speciality: lake Insjön. Lakes deepest point is 17 metres. Since the lake is so deep and only has a small brook for an outlet, the water is changed very slowly. It takes 15 years for the water to be changed, when the average for Finnish lakes is about two years. Because of this it is better not to leave any water damaging substances like shampoo or dish detergent in the lake.
Within a walking distance from the harbour in Byviken there is an old farm, where in summer visitors find an enchanting café with home-made baked goods. Also sauna and a humble accommodation is available.
There are ferry services to Björkö from Kirjais: m/s Falkö (finferries.fi/en). From the ferry is marked trail to Byviken (1 km). Due to the timetable visitors using ferry need to spend at least one night in the island. Tents are allowed.

National parks are nature reserves, whose key task is to safeguard biodiversity and enable people to enjoy and relax in nature on the terms of nature conservation. All national parks in Finland are managed by Metsähallitus.