Book KOK Langkaia if you want the cleanest visitor-friendly version of Oslo's sauna-and-fjord ritual: a wood-fired sauna on the water, a ladder into the Oslofjord, and a front-row view of the Opera
Travel guide
Oslo Badstuforening runs two floating sauna villages in Bjørvika.
Travel guide
SALT is a sauna complex, a bar, an outdoor food court, a concert venue, and a fire-pit hangout, all crammed onto the waterfront at Langkaia.