The Gulf of İzmir (Turkish: İzmir Körfezi), formerly known as the Gulf of Smyrna, is a gulf on the Aegean Sea, with its inlet between the peninsula of Karaburun and the mainland area of Foça. It is 40 miles (64 km) in length by 20 miles (32 km) in breadth, with an excellent anchorage.
The city of İzmir, an important Turkish seaport, surrounds the end of the gulf. Levent Marina is the only marina inside the city of İzmir. It is on the southern shore at 38° 24′ 40″ North and 27° 04′ 01″ East.