The canyons of the Duero and the submerged water mills Nature · Pereruela, Sayago, Zamora Image of Pereruela, not of the place itself. The municipal district borders the natural park of Arribes del Duero, where the river opens deep canyons; the old water mills that ground on its banks were left partly beneath the waters of the Villalcampo reservoir. Photo: Javierlparada (CC BY-SA 3.0) What to see and do in Pereruela