Mount Estépar, secluded by its thick tree cover and with easy to dig, sandy soil, was the ideal location for extermination in the province of Burgos. It was located just 21km from the town of Burgos and well connected to the central prison by the road that led to Valladolid. More than 300 people were shot here between August and October 1936. They were ‘taken out’ from the Burgos prison under the false pretext of being released, and instead handed over to Falangists who, with help from the Civil Guard, transferred them directly to this place to be executed.