Jeju Island is South Korea's largest island, vested in Jeju province. The island is in the Korea Straits, down the Korean Peninsula in the south of the South Peninsula. Jeju is the only self-governing province in South Korea, meaning that the province is run by local residents rather than politicians from the mainland. This includes a natural World Heritage Site, Jeju Volcano Island, and lava tubes. Jeju is a popular holiday destination and a large part of the economy is your citizen depends on tourism and economic activity from the naval base.