Tetramythos Winery is located in Ano Diakopto, Aegialia, on the slopes of Mount Helmos. The vineyards of the estate are located at an altitude of 450-1000m. and due to the microclimate, soil, exposure, contact with the aura of the Corinthian Gulf as well as cultivation techniques (cultivated in an organic way) they give excellent raw material. Among the famous wines of the estate is Mavro Kalavrytino, which is the only monovarietal wine from the rare variety.