With a total length of approximately 50 km and a width of 10 to 20 km, it stretches nearly diagonally from northwest to southeast, from the Euripus Strait, which connects it to the North Euboean Gulf, to the Petalies Gulf near Agia Marina in the south.
This body of water spans roughly 50 kilometers in length and 10 to 20 kilometers in width, stretching diagonally from the northwest to the southeast, linking the Euripus Strait to the Petalies Gulf near Agia Marina in the south.