The Seomjin River is a river in South Korea. It flows through southeastern North Jeolla Province, eastern South Jeolla Province, and western South Gyeongsang Province province. It flows into the Korea Strait. The Seomjin River originates from Palgongsan and flows for 212.3 kilometers before reaching its final destination in Gwangyang, where it enters Gwangyang Bay.
The Seomjingang watershed comprises some 4,896.5 km². This area includes both farmland and a great deal of pristine mountain country, including the Jirisan area. A wide variety of animals are found along the river, including the European otter, Lutra lutra. Principal tributaries include the Boseong River and Yocheon stream.
