38°33′N 23°30′E / 38.550°N 23.500°E / 38.550; 23.500 The Gulf of Euboea, Euboean Gulf, Euboic Sea or Euboic Gulf (Greek: Ευβοϊκός Κόλπος, romanized: Evvoïkós Kólpos) is an arm of the Aegean Sea between the island of Euboea (northeast coastline) and the Greek mainland (southwest coastline). Trending diagonally northwest–southeast, the gulf is divided by the narrow Strait of Euripus, at the town of Chalcis. The North Euboean Gulf is about 80 kilometres (50 mi) long and up to 24 kilometres (15 mi) wide, and the South Euboean Gulf is about 48 kilometres (30 mi) long, with a maximum width of 14 kilometres (9 mi).

• Argolic Gulf, Saronic Gulf - nearby gulfs of Greece

• Encyclopædia Britannica, article "Gulf of Euboea" (description), 2006, webpage: EB-GulfEuboea.