Allas Sea Pool - https://allasseapool.fi/

Allas Sea Pool, located at the south end of the city by the Market Square, has enlivened the city centre waterfront and claimed its place as a popular centre of seaside bathing and urban culture for Helsinki residents.The pools Sauna World has five different saunas with changing rooms. At the heart of the sauna building is a new 30-seat shared-use observation sauna with views of the far archipelago and the outskirts of the island. At the pool, you can swim in the 27-degree pool or in the saltwater pool, where the water is always warm from the sea. In summer, children can swim in their own pool or with an adult in the large pool. The water in the children’s pool is also always 27 degrees.Allas Sea Pool features a cafe, Sea Grill restaurant and the Sky Bar.