The Tera as It Flows through Rebollar Nature · Rebollar, El Valle y La Vega Cintora, Soria Image of Rebollar, not of the place itself. The river that comes down from the Sierra Cebollera waters the municipal district and sustains a narrow meadowland of hay meadows and poplar groves, the landscape that made possible the cattle rearing from which the valley's butter was born. Photo: Esther Pérez Pérez (CC BY-SA 4.0) What to see and do in Rebollar