Isthmus of Corinth
National Road 8 passes along the northern coast of the Saronic Gulf, through the Isthmus of Corinth and further, along the southern coast of the Gulf of Corinth, and ending in downtown Patras. It runs through five regional units: Central Athens, West Athens, West Attica, Corinthia and Achaea. Since the opening of National Road 8A it is mainly used for local traffic in the coastal towns.