The Valdavia River is a Spanish river that rises in the foothills of the (Monastery of San Roman) in Santibáñez de la Peña; it passes through the , to which it gives its name, through villages such as Congosto de Valdavia, Buenavista de Valdavia, Villaeles de Valdavia and Castrillo de Villavega; receives the waters of the in Osorno; and enters the Burgos province to flow into the Pisuerga next to Melgar de Fernamental. This last section that goes from the mouth of the Boedo to its junction with the Pisuerga, is called Abánades River.