In 1896 the British company "The Sierra Company Limited" got permission from the Spanish government to build a narrow gauge railway to transport iron from the mines of the Sierra de la Demanda to Burgos, and once there to the Basque steel mills through the Burgos-Bilbao railway line.
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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.