The West Sea Tidal Flats: A Mudscape That Became a World Heritage Site서해 갯벌: 세계유산이 된 진흙 바다

On Korea's west coast, the sea vanishes twice a day. The Yellow Sea has one of the world's most extreme tidal ranges — in places the water drops more than nine meters between high and low tide — and when it recedes, it exposes vast plains of soft mud called getbol. What looks like empty wasteland is actually one of the most productive ecosystems on the planet. The mud teems with clams, crabs, octopus, and countless invertebrates, which is why these flats have fed coastal villages for centuries and why they are a life-or-death refueling stop for migratory shorebirds traveling the East Asian-Australasian Flyway between Siberia, Alaska, and Australia. In July 2021, UNESCO inscribed 'Getbol, Korean Tidal Flats' as a World Natural Heritage site — four areas in Seocheon, Gochang, Sinan, and Boseong-Suncheon hosting around 2,150 recorded species, including 22 globally threatened or near-threatened ones. In July 2026, UNESCO approved expanding the listing with additional sites including Seosan, Goheung, Muan, and Yeosu. For visitors, the getbol offers something rare: you can walk (with a guide) on the sea floor, dig for clams alongside local haenyeo-like foragers, and watch clouds of shorebirds wheel over the mud at sunset — a landscape Korea nearly lost to land reclamation, now protected as world heritage.