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Hola Dennis - I can tell you that this was one of the hardest "off-track" sections of the Camino. About the only other place that came close was the section about 1 or 2 km west of Atapuerca. There was supposed to be "cyclist" detour, but unfortunately I missed it and ended up carrying, lifting my bike up and over some very large rocks - it took 35-45 mins to cover less than 800 metres. Fortunately I had scheduled two days in Burgos - I needed them to recover.