The Gulf of Patras (Greek: Πατραϊκός Κόλπος Patraikós Kólpos) is a branch of the Ionian Sea. On the east, it is closed by the Strait of Rion between capes Rio, Greece and Antirrio, near the Rio-Antirio bridge. On the west, it is bounded by a line from Oxeia island to Cape Araxos. It is 40–50 km long, 10–20 km wide, and has an area of 350–400 km². The Port of Patras lies to the southeast and is the only major port on the gulf. It serves ferries to Ancona and Brindisi in Italy along with Kefallonia. Messolonghi also has a port. There are beaches in the south, the east and parts of the north. The old ports of Rio-Antirio lie east of the gulf. The gulf is rich in fish.