Overview ÖTILLÖ is the race that started swimrun: teams of two run in their wetsuits and swim in their shoes from island to island, and its World Championship crosses 24 islands of the Stockholm archipelago, 61 km of trail and 9 km of open water from Sandhamn to Utö. The World Series takes the format to lakes, coasts and islands in Europe and the United States; the 2026 calendar ran from Rügen, Orcas Island and Utö through Engadin, Gothenburg, Casco Bay and Åland to Cannes, Colorado and Austin. Most stops offer three distances - a World Series course of roughly 40 km, a Sprint and a short Experience course - and teams qualify for the championship on Swimrun Ranking points earned at World Series races. On site The Colorado race shows the shape of a stop: start and finish at the Soldier Canyon Event Facility in Bellvue, reservoir swims in Horsetooth Reservoir and single-track through Lory State Park above 5,000 feet, with the World Series course covering 36.5 km, 8 of it swimming. Partners must stay together the whole way, and a tether between them is mandatory in bad weather. The championship itself finishes at Utö Värdshus, the inn on Utö. For the 20th year in 2026, ÖTILLÖ added an anniversary race, a 7 km loop around Stockholm University ending at Bockholmen. Audience Everyone on the course is racing. Teams enter as women's, men's or mixed pairs, and championship places go to teams with ranking points, plus a few wild cards for newcomers each year. The Experience distance is built for first-timers. Track record In 2002 Anders Malm and friends bet that the last team of two to reach Sandhamn would pay for the hotel, dinner and drinks, and took more than 24 hours to cross the archipelago. Michael Lemmel and Mats Skott turned it into a race in 2006, when 2 of 11 teams finished. By 2009 it drew 50 to 60 teams, Engadin became the first race outside Sweden in 2014, and the championship field grew to 160 teams. Hugo Tormento and Max Andersson set the men's record of 7:00:59 in 2022. Brand presence The partnership on offer here is series-wide, across every stop. In 2026 the series site carried Ark, Dryrobe and Umara as partners.