El Maestrazgo is one of the most spectacular and challenging areas for cycle tourists on the Camino del Cid route. It is located in the Spanish provinces of Teruel and Castellón. This 240 km circular route takes travellers through no fewer than five protected natural areas.
More info about Camino del Cid: https://en.caminodelcid.org/
More info about the Maestrazgo ring: https://en.caminodelcid.org/routes/maestrazgo-circular-route-cycling-554418/