Jeju Island is the largest island in South Korea, located in the Jeju Province. The island lies in the Korea Strait, below the Korean Peninsula, south of the South Jeolla Province.

Singapore is a sovereign island city-state in maritime Southeast Asia. It lies off the southern tip of the Malay Peninsula, bordering the Straits of Malacca to the west, the Riau Islands to the south, and the South China Sea to the east. The country's territory is composed of one main island and 63 satellite islands and islets. It has the second greatest population density in the world.