The Oca river on its way to the Ebro Nature · Los Barrios de Bureba, La Bureba, Burgos Image of Los Barrios de Bureba, not of the place itself. The Oca crosses the municipal district in its final stretch before giving itself up to the Ebro at Oña. It is, together with the Tirón, the Homino and the Oroncillo, one of the four rivers that spread the water across the whole plain of the Bureba. Photo: Eduvet (CC BY-SA 3.0 es) What to see and do in Los Barrios de Bureba