Founded in 1914 in San Martin de Unx, this winery is the second oldest cooperative in Navarre.

It is located in the Baja Montaña area of Navarre, a sub-humid dry area with Atlantic influences, good amounts of rain and sun, and excellent winds which air the vineyards. Production of wine is low and of high quality, which brings complex, highly intense wines reflecting the characteristics of the terroir.

Bodegas San Martin specialises in Grenache grapes, and is working on two projects to recover old red grape and white grape vines of this variety.