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. Places by the gulf In Attica (from south to north): Lavrio Porto Rafti Artemida Rafina Nea Makri Agia Marina In Euboea (from northwest to southeast): Styra Marmari Karystos External links Petalioi Gulf on GTP Travel Pages (in English and Greek) Euboea Gulfs of Greece Gulfs of the Aegean Sea Landforms of Euboea (regional unit) Landforms of East Attica