Named for the Altxerri Cave in the Basque region where the oldest stone paintings in Europe are found. Winemaker Mikel Errasti and his family farm two sustainably managed, organic and biodynamic hectare planted on seaside hills facing the sun. 100% indiginous Hondurrabi Zuri grapes are vinified with natural yeasts and traditional production methods. Traditional fizz, bone dry, with balanced acidity and fruit notes.