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The XTERRA O-SEE Ultra Trail is a multi-distance trail running weekend held in and around Kurort Oybin in the Zittau Mountains Nature Park, Germany. The event brings a programme of technical, sandstone‑lined courses ranging from short youth distances up to a 100 km ultra, and is marketed as a wild, demanding race that highlights steep ascents and scenic viewpoints. The 2026 edition runs across 16–18 October with the main trail races scheduled for 17 October and a festival‑style start/finish area in Oybin.
For 2026 the weekend also incorporates the XTERRA European Trail Run Championship for the 25 km and 50 km distances, with qualification slots to the 2027 XTERRA Trail Run World Championship available for top age‑group finishers. Selected long distances (100k, 75k, 50k and 25k) include organiser GPS live‑tracking and electronic timing, and the programme also offers family and youth races plus Canicross events. The local organiser is O‑SEE Sports e. V., and the official event homepage and athlete guides provide detailed course maps, mandatory kit lists and up‑to‑date registration information.
Start/Finish: Bürgerallee, Kurpark, Oybin, Zittau Mountains Nature Park, Germany
