The
Petalioi Gulf ( -
Kolpos Petalion) is a
gulf of the
Aegean Sea,
Greece. It stretches between the east coast of
Attica and the south tip of the island
Euboea. It takes its name from the
Petalioi islands, that are situated in the northeastern part of the Gulf, off the Euboean coast. The Petalioi Gulf is connected to the
South Euboean Gulf to the north. Its length is approximately 50 km long from north to south and its width is approximately 5 km in the north to about 50 km in the south. There are several uninhabited islands in the gulf, including the Petalioi and
Makronisos. Promontories include Strongylo and Vigla in the island of
Euboea.