The Messapio is a small mountain range located in the northeastern part of Boeotia and the mainland part of Euboea regional unit in central Greece. It borders on the North Euboean Gulf and the Euripus Strait to the north and east. Its highest point is 1,021 m. It is 20 km long and 10 to 15 km wide and covers an area of 300 km². It separates the area around Chalcis from the Boeotian plains around Thebes. In the south, on the slope of the 740 m high mountain Ypato, there is the monastery of the Transfiguration of the Saviour. The nearest mountain ranges are the Ptoo to the northwest. The A1 motorway passes south of the mountain.