San Asensio is a town and municipality in the north of the autonomous region of La Rioja. It is on a hill in the Ebro and Najerilla Valleys. Economic activity centres mainly on vine growing and producing quality wines with the Rioja Designation of Origin quality label. The town is thought to be the «birthplace of light red wine» and this is the basis for the party held in July which involves a wine fight.
Festivals for San Esteban and the Virgen de Davalillo are held on the first Saturday in September. On the 25 July, the clarete let red wine fight is held.