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The Saronic Gulf (Greek: Σαρωνικός κόλπος, Saronikós kólpos) 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.
The gulf includes the islands of; Aegina, Salamis, and Poros along with smaller islands of Patroklou and Fleves. The port of Piraeus, Athens' port, lies on the northeastern edge of the gulf. The site of the former Ellinikon International Airport is also in the northeast.
Beaches line much of the gulf coast from Poros to Epidaurus, Galataki to Kineta and from Megara to Eleusis and from Piraeus down to Anavyssos. Athens' urban area surrounds the northern and the eastern coasts of this gulf.
The volcano of Methana is to the southwest along with Kromyonia at the Isthmus of Corinth, Aegina and Poros. Methana is also the youngest most active volcano center and forms the northwestern end of the cycladic arch of active volcanoes that includes Milos island, Santorini island and Nisyros island. A hydropathic institute at Methana makes use of the hot sulphurous water that still surfaces in the area. The most recent eruption was of a submarine volcano north of Methana in the 17th century.
The gulf has refineries around the northern part of the gulf including east of Corinth and west of Agioi Theodoroi, Eleusis, Aspropyrgos, Skaramangas and Keratsini. These refineries produce most of Greece's refined petroleum products, a large proportion of which are then exported. Commercial shipping to the refineries, Piraeus and to and from the canal make the gulf quite a busy area with commercial shipping.
The origin of the name comes from the mythological king Saron who drowned at the Psifaei lake (modern Psifta). The Saronic Gulf was a string of six entrances to the Underworld, each guarded by a chthonic enemy in the shapes of thieves and bandits.
The Battle of Salamis, just to the west of modern day Piraeus, was a major turning point in European history which saw the Athenians defeat Xerxes assuring Athens its place as the cradle of modern European culture.
Fault lines dominate especially in the northwestern part.The port of Cenchreae used to situate here.
An earthquake on Monday January 4, 2005 rumbled the Saronic at the Richter scale of 4.9. It tremored Aegina and Nafplion and went as far as Kalamata. It occurred at 16:00 (UTC), 18:00 local time (BNST).
- Kechries Bay
- Saronic Bay Coast (basin)
- Loutro Basin
- Megara Bay/Megara Gulf
- Cephissus River (Eleusis)
- Cephissus (Athenian plain) between Piraeus and Phaliron.
Sailing in the Saronic Gulf 
Sailing is popular in the Saronic Gulf which, like the neighbouring Argolic Gulf, benefits from the Attic mainland's partial shelter from the summer Meltemi wind that can reach Force 7 and above further to the east in the Aegean islands.