Comuneros Dam Monument · Zarra, El Valle de Cofrentes-Ayora, Valencia Image of Zarra, not of the place itself. The Presa de los Comuneros, referred to in the article on Zarra as the Presa de los Comunes, is located next to the Cerro Gordo, in an area set up as a free camping ground, within the canyon of the Zarra river. Downstream lies the Presa del Rentón, in a spot of great scenic value. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Zarra