Silmido Island

Address: Silmido Island (Silmido-do), Incheon, South Korea

Silmido is a small, uninhabited island off the west coast of South Korea in Incheon. It is widely known for its role as a training site for a covert military unit in the late 20th century.

The island contains concrete ruins and traces of former training facilities rather than regular tourist infrastructure. It attracts interest mainly for its modern historical significance rather than natural features.

In the years following a 1968 assassination attempt on the South Korean presidency, a secret unit was formed and trained on Silmido; the unit later became involved in a mutiny. Details of the episode were restricted for decades and were publicized in the 1990s, becoming the basis for public discussion and later cultural portrayals.

Silmido lies in the Yellow Sea near the Incheon archipelago and is administratively part of Incheon metropolitan area in northwest South Korea.

• Site remains: The island is uninhabited and small, with remnants of concrete structures linked to its mid-20th-century military use.
• Historical significance: The story of a clandestine South Korean commando unit trained on the island and a subsequent mutiny became public in the 1990s and inspired a 2003 film titled Silmido.

Silmido does not have regular civilian ferry service; access is controlled and sometimes limited for safety or military reasons. Most visitors encounter the story via Incheon: take the subway to Incheon Station or Incheon Port and consult local tour operators or the Incheon city website for any authorized tours. For a contextual visit, travel to mainland memorials and museums in Incheon that cover Unit 684 and related Cold War history.

• If timing a visit around the film or book about Unit 684, avoid expects of dramatized narratives-focus on the island's actual features: the old barracks foundations and the rusting lighthouse base.
• Military access is restricted; check local Incheon notices and the municipal ferry schedules for nearby islands rather than expecting direct service to Silmido.
• Visit the nearby mainland memorials in Incheon for full context on the 1960s and 1970s events tied to the island.