The South Euboean Gulf (, Notios Evvoïkos Kolpos) is a gulf in Central Greece, between the island of Euboea and the Greek mainland (Boeotia and Attica). 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.

Islands

Petalioi (largest islands:Megalonisos, Chersonisi), Kavaliani, Stouronisi

Bays by the gulf

Agion Apolstolon Bay, south

Oropos Bay, southwest

Aliveri Bay, north

Boufalo Bay, northeast

Almyropotamos Bay, northeast

Places by the gulf

Sessi Beach, south

Varnavas Beach, south

Kalamos Beach, southwest

Nea Palatia, southwest

Skala Oropou, southwest

Chalkoutsi, southwest

Pigadaki, southwest

Dilessi, west

Paralia Achlidas, west

Faros, west

Chalkida, northwest

Eretria, northwest

Amarynthos, north

Aliveri, north

Panagia, northeast

Landforms of Attica

Euboea

Gulfs of Greece

Gulfs of the Aegean Sea

Landforms of East Attica

Landforms of Central Greece

Landforms of Euboea (regional unit)

South Euboean Gulf