Serón de Nágima is a municipality in Soria in the community of Castilla y León, whose history dates back to archaeological remains from the Bronze Age, Celtiberians and Romans.
Due to its border position, it was a prominent location during the defense against al-Andalus. Its castle, dating back to the 14th or 15th centuries, is in a very poor state of conservation, given that it is built with clay materials that are not very resistant to erosive action.