Castro Martin operates in Rías Baixas, the Atlantic-facing subregion of Galicia where Albariño thrives in maritime conditions. The winery's core expression is a straightforward Albariño, rated 88.4 by prestige critics including Wine Spectator, Wine Enthusiast, Wine Advocate, and Decanter. Two bottlings aged sur lie—Casal Caeiro Sobre Lias Albariño and Sobre Lias Albariño—extend the range with textural complexity, averaging 87.5 and 87.3 respectively across the same critical panel. Rías Baixas Albariño is defined by salinity, mineral precision, and stone-fruit character shaped by the region's cool Atlantic influence and granite soils. Castro Martin's focus on this single varietal reflects the region's singular strength.