Seonyudo, Gunsan

Seonyudo is an island in Okdo-myeon, Gunsan, North Jeolla Province, South Korea. The island has an area of 2.12 km2, which is only about a quarter of Yeouido in Seoul. The island's coast is about 12.8 km long.

It has long been famed for its beauty; its name means "island where the immortals play", which implicitly assumes its beauty was fit for the gods. It is a popular tourist attraction, and is known for its white sandy beaches, waterfall, and scenic mountains.

Seonyudo was the capital of the Gogunsan Islands. It also served as a naval command post during the Joseon Dynasty. Admiral Yi Sun-shin played an important role during the Imjin War, spending days on the islands to prepare for his next battle after winning the Battle of Myeongnyang.