The floating sauna ritual

The other not-to-be-missed water-related event is the 'floating sauna', i.e. both wooden huts with large windows resting on rafts moored to the jetty. The first of these, Måken, was built in 2013 and is still a favourite with locals and tourists alike. Three years later, the non-profit Oslo Badstuforening association was founded by a group of diplomats from the Norwegian Foreign Ministry who were passionate about ice baths. This association (which registers 260,000 visits a year, mainly concentrated between September and April) includes the city's two main sauna villages, Sukkerbiten and Langkaia, both in the Bjørvika area, a few minutes' walk from the Opera House. Sukkerbiten, carved out of a boat and also used for short cruises in the fjord, stands out among the more unusual facilities. A session in these saunas (entry for 90 minutes costs 260 kroner, about 25 euro), complete with a dip in the fjord's icy water, is a 'social' experience that is hard to forget, as well as a way to discover one of Oslo's most authentic souls.

https://oslobadstuforening.no/