The Sixtus Alpentriathlon Schliersee is an M-distance triathlon held in Schliersee, a town in Upper Bavaria, Germany, with the swim taking place in the lake. It typically occurs near the end of June. The race demands more than a standard swim-bike-run sequence; the bike leg includes significant climbing, making the alpine setting a key element of the challenge, not merely a backdrop.
Competitors swim in Schliersee, cycle through the Bavarian Alpine region, and conclude with a run through the town. The event has attracted over 700 triathletes, comprising solo participants and relay teams. Its standing is based on the bike course's elevation gain as much as the mountain scenery. The race has experienced disruptions in its recent past, so this upcoming edition holds particular significance for athletes who consider Schliersee one of Europe's more demanding alpine triathlons.