What is "xinomavro"

Xinomavro ( Greek: Ξινόμαυρο , lit. 'sour black') is the principal red wine grape of the uplands of Naousa in the regional unit of Imathia, and around Amyntaio, in Macedonia, Greece. This grape is primarily cultivated in Naousa, Goumenissa, Amyntaio, Rapsani, Trikomo, Siatista, Velventos, and, on a lesser scale, on Mount Athos, at Ossa, Ioannina, Magnesia, Kastoria and Trikala. The total cultivated area is about 18 km².