Montes de Oca is a comarca located east of the province of Burgos, in the autonomous community of Castile and León. It is bounded on the north by La Bureba, south by the Sierra de la Demanda comarca,

Comarca del Arlanza is a comarca located south-west of the province of Burgos in the autonomous community of Castile and León. It is bounded on the north by the Odra-Pisuerga and the Alfoz de Burgos,