The confluence of the Odra and the Pisuerga Nature · Pedrosa del Príncipe, Odra-Pisuerga, Burgos Image of Pedrosa del Príncipe, not of the place itself. In this municipal district the Odra gives its waters to the Pisuerga after sixty-five kilometres from its source north of Peña Amaya. The joining of the two rivers gives its name to the whole comarca. Photo: K'melotFan (CC BY 3.0) What to see and do in Pedrosa del Príncipe