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.