The island of Euboea extends over an area of 3.660 square kilometers,it is 175 kilometers long and has a width ranging from 6 to 50 kilometers.
In antiquity Euboea was considered to be part of central mainland Greece that had been detached from it during an earthquake.
The narrowest part of the Euboean gulf is called Euripos and is hardly 40 meters wide.It is connected with the mainland by a bridge, and one can observe a unique phenomenon of the tides. Every six hours the movement of the sea water
passing under the bridge changes directions from North to South and vice versa.
Euboea displays quite important water ecosystems which are meeting places for a variety of birds, amphibia, reptiles and mammalia, and where many migratory birds find shelter.