It is bounded on the north-west by La Bureba, north-east by the Páramos comarca, south-west by the Arlanza comarca, south-east by the Sierra de la Demanda, on the east by the Odra-Pisuerga comarca and west by the Montes de Oca.
It is bounded on the north-west by the province of Cantabria, north-east by the province of Biscay, south by La Bureba, south-east by Ebro, south-west by Páramos, and on the east by the province of Álava.
Gonzalo Ruiz (died 1205), also known as Gonzalo Rodríguez, former ruler of La Bureba in Spain