GIPUZKOAST 100k Challenge: Running for a trash-free coastline.
The route links the entire coast of Gipuzkoa, Basque Country, using the “Camino de Santiago Norte” in a single day—starting in Hendaye (France) and finishing in Ondarroa (Biscay, Basque Country).
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NOTE: I've completed the track in approximately 15h 50' (starting at 6:05 in the morning in Hendaye and finishing at 21:55 at night in Ondarroa).