The Saronic Gulf or Gulf of Aegina in Greece forms part of the Aegean Sea and defines the eastern side of the isthmus of Corinth. It is the eastern terminus of the Corinth Canal, which cuts across the isthmus. Islands that are lined in the middle of the Gulf are Aegina, Salamis, and Poros along with smaller islands of Patroklou and Vleves . The port of Piraeus, also Athens' port is lying on the northeastern edge of the gulf. Ellinikon International Airport, used to stood is also in the northeast. Beaches are lined up to much of its coast from Poros to Epidaurus, Galataki to Kineta and from Megara to Eleusis and from Piraeus down to Anavysso . Athens' urban area surrounds the northern and the eastern coasts of this gulf.

Bays in the gulf include Phaleron Bay, also Faliro Bay near Faliro (Phaleron) southwest of Athens, Elefsina Bay to the north and Kechries Bay in the northwest. The closest to Athens.

The volcanoes of Methana is to the southwest along with Kromyonia at the Isthmus of Corinth, Aegina and Poros.

The gulf has refinerines around the northern part of the gulf including east of Corinth and west of Agioi Theodoroi, Eleusis, Aspropyrgos, Skaramangas and Keratsini, mainly in the northern part and the most refineries around gulfs in Greece and production. The ships cross these routes. The total production are one of the highest in Greece. Most of the oils are mainly exported. The route cross the strait between Salamis and Perama. These refineries are Athens' main oil production and the rest of Greece.

The origin of the name comes from the mythological king Saron which pursued the Psifaei lake (modern Psifta ) and drowned. The Battle of Salamis changed the development of Europe until today.

Fault lines dominate especially in the northwestern part.

An earthquake on Monday January 4, 2005 rumbled the Saronic at the Richter scale of 4.9. The epicentre was at ?. It tremored Aegina and Nafplio and went as far as Kalamata. It occurred at 16:00 (UTC), 18:00 local time (BNST).

The port of Cenchreae used to situate here.

Tributaries

• Kechries Bay
• Saronic Bay Coast (basin)
  • Lower Galataki Basin
  • Upper Galataki Basin
  • Examilia Basin
  • Athikia Basin
• Loutro Basin
• Megara Bay /Megara Gulf
• Cephissus River (Eleusis)
• Cephissus (Athenian plain) between Piraeus and Phaliron.

Capes

• Cape Lomvardi - SW of Vouliagmeni