XTERRA O-SEE Challenge 2026

The O-SEE Challenge is a traditional international cross-triathlon in the Zittau Mountains Nature Park and at the Olbersdorfer See (O-SEE) with numerous individual competitions and categories. The "O-SEE" is part of the global XTERRA series and is one of its highlights in Europe. The O-SEE Challenge has hosted European and national championships multiple times. In 2024, the ITU Cross Triathlon World Championships were held as part of the O-SEE Challenge. The event is framed by an extensive supporting program at the event area at Olbersdorfer See. A highlight is the O-SEE Open Air on the Saturday after the main competition day, when the competition area transforms into an atmospheric festival location.