Sarnago is a town in the Tierras Altas region, in the province of Soria, community of Castilla y León. It belongs to the municipality of San Pedro Manrique since 1972.
The origins of Sarnago may date back to pre-Roman times, since a nearby mountain known as "el Castiillo" could have been the location of a surveillance watchtower.
The time of greatest splendor of Sarnago was during the period of the Mesta (from the 13th to the 19th centuries), an organization created by Alfonso
This small town has been losing population with the passage of time and the abandonment of rural activities, but an association founded in 1980 is recovering and restoring different infrastructure and heritage of Sarnago, such as the public fountain, the washing places, as well as the public lighting. . A project has recently been launched to create a "coliving" and attract population to the town.