XTERRA O-SEE Ultra Marathon 2026

The XTERRA O-SEE Ultra Marathon is a trail-running event held in Kurort Oybin, within the Zittau Mountains Nature Park in eastern Germany. Situated in the border triangle with Poland and the Czech Republic, its longer routes traverse the Zittau Mountains, with their small size and steep inclines, rather than high alpine terrain. Participants can select from various distances, including shorter trail races and ultras, with options around 15 km, 25 km, 50 km, and 65 km, in addition to beginner trails and short cross-country races for children. The 50K is a UTMB Index race covering 50.30 km with 2,120 meters of elevation gain, while the 65K involves approximately 2,620 meters of climbing. The courses wind through forest and mountain paths in Germany's smallest low mountain range. The challenge stems from continuous ascents, rugged trail sections, and concentrated elevation rather than significant altitude. The 25.23 km race alone features 1,073 meters of climbing and descent, supported by three aid stations, an eight-hour time limit, and a cap of 300 participants. The event is also part of the XTERRA Trail Run World Series, attracting competitive trail runners alongside local participants, ultra specialists, and families opting for the shorter youth and beginner formats. A 50K edition with 99 finishers indicates a solid field size without the feel of a large urban race.