Cheju Strait

The Cheju Strait separates the volcanic island of Cheju from the island-strewn southern coast of Korea. Routes across these waters linked the island, once known as Tamna, with the mainland. After the Mongols suppressed the Sambyŏlch'o resistance in 1273, they ruled the island directly for nearly a century. Under Joseon, Cheju again became its common name, recalling a place reached across the sea.