Trail of el río Agres por la Sierra de Mariola Nature · Alfafara, El Comtat, Alicante A 9-kilometre trail that runs through the Sierra de Mariola following the course of the Agres river and the old mills of the municipality of Alfafara. Among them stands out the Molí Rupestre (Rock Mill), carved directly into the rock and more than 400 years old, one of the testimonies to the traditional water-powered industry of the El Comtat region. Photo: bladimiro (CC BY-SA 3.0) What to see and do in Alfafara