The Municipality of Servia-Velvento in collaboration with other local bodies and associations (Western Macedonia District, Kozani’s Swimming Club, Nautical Club of Kozani) organize every year the swimming crossing of Lake Polyfytos. The Organization Committee chooses the participants based on the athletes’ experience, their participation in previous events, as well as their performances. The route is approximately 5000m long and the race comes to an end, when all the athletes have reached the finish point at the Nautical Club’s pier. This event is an institution for the area, draws many participations from athletes and is very popular to the audience that enjoys various activities that take place at the same time. Young children participate in the Small Crossing of 500m.