Yeosu (Yeosu-si) is a city in South Jeolla Province, South Korea. Old Yeosu City, which was founded in 1949, Yeocheon City, founded in 1986, and Yeocheon County were merged into a new city in 1998. The city of Yeosu consists of the Yeosu peninsula as well as 317 islands (49 inhabited, 268 uninhabited).
Being midway along southern coast of South Korea, it is flanked by Namhae County in South Gyeongsang Province to the east with natural waterway, and the Bay of Suncheon to the west and northwest, the city of Suncheon sprawling along its banks. The city has three different City Halls. On 1 April 1998, the cities of Yeosu and Yeocheon, along with Yeocheon County merged to form the unified city of Yeosu.
In the harbour there is a full-size model of one of Admiral Yi's turtle ships, timber shelled vessels which were used to defeat the Japanese navy. There is a beach with volcanic 'black' sand near Yeosu that is popular with Korean tourists. The name of the beach is Manseongri Beach. There are public showers and restrooms as well as on-duty lifeguards. Many restaurants located along the beach have beach-side tables and serve various seafood dishes. It is also possible to take ferries to many local islands for an authentic taste of rural Korea. Gejang, or marinate raw crabs is a representative speciality of Yeosu and a traditional Jeolla cuisine dish.