The Archipelago Foundation's sauna open to the public. The fee is paid with Swish.&nbsp;The sauna is open for the season (2025). 

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Sauna on Ostholmen

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Explore Archipelago is your guide to the vast archipelago landscape between Sweden and Finland. This service was developed as part of the Archipelago Access project, which received funding from the Interreg Central Baltic Programme. It is managed by the City of Turku in partnership with the Stockholm Archipelago Foundation.