ÖTILLÖ is the origin of the sport of swimrun. The inaugural race was held in 2006 on a route between Sandhamn and Utö in the Stockholm archipelago. Today these are the grounds of the ÖTILLÖ Swimrun World Championship — the pinnacle of the sport. The ÖTILLÖ organization also hosts a World Series in a range of countries, all being qualifiers for the World Championship. Photo: Pierre Mangez / ÖTILLÖ.