Boquerón del Estena gorge Nature · Navas de Estena, Montes de Ciudad Real, Ciudad Real A narrow gorge cut by the River Estena through the quartzites of the Cabañeros National Park, reached by a waymarked route setting out from Navas de Estena. It shelters a relict flora with yews, birches, alders and royal ferns. Photo: Juan Fernández (CC BY-SA 2.0) What to see and do in Navas de Estena