The protected banks of the Duero Nature · Rebollar, El Valle y La Vega Cintora, Soria Image of Rebollar, not of the place itself. Although the municipal district barely adds up to ten square kilometres, it includes 19 hectares of the Riberas del Río Duero area, 151 of the Sierras de Urbión y Cebollera and 147 of the bird protection zone of the Sierra de Urbión. Photo: Esther Pérez Pérez (CC BY-SA 4.0) What to see and do in Rebollar