With over 25 years of history, the O-SEE Challenge is one of the longest-running events on the XTERRA circuit. This three-day festival brings together elite, age-group, and youth athletes from around the world to take on the battle-tested trails of Zittau at Germany’s most renowned off-road triathlon.
In 2026, the XTERRA European Trail Run Championship joins the O-SEE Trail lineup, bringing a global community of runners together beneath the medieval ruins of the Zittau Mountains. While European titles and World Championship slots are decided over the 25K and 50K tracks, Discovery races welcome beginners and kids, and two Endurance races take runners deep into the 75K and 100K loops that cross the border territory.
parkrun is such a simple concept: turn up every Saturday and volunteer, walk, jog or run 5k.
Are you ready for a unique adventure? 🏃♂️ Come challenge the trails of the Mattoni Liberec Trail Run! With its 22 km course, this competition combines the vibrant energy of the city with the breathtaking landscapes of the surrounding nature 🌿. A perfect mix for thrill-seekers and outdoor race enthusiasts.