Why South Korea's vast mudflats are a global sanctuary for endangered migratory birds

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: Getbol are not just mud; they are complex coastal ecosystems that serve as vital stopovers for birds traveling the East Asian-Australasian Flyway. Recognized as a UNESCO World Heritage Site, these tidal flats host hundreds of species, from tiny benthic diatoms to the critically endangered spoon-billed sandpiper, in a delicate balance.

The Getbol, or Korean tidal flats, are sophisticated sedimentary systems that emerged following the Last Glacial Maximum. Their formation is a dynamic interplay between river-borne sediment and the relentless forces of tidal currents, waves, and wind. Because of the regional monsoon climate, these flats undergo a seasonal cycle: winter brings erosion and chemical weathering, while summer facilitates the deposition of new sediment. These environments manifest in four distinct types—estuarine, open embayed, archipelago, and semi-enclosed—each offering unique ecological niches.

In 2021, four specific sites were inscribed as a UNESCO World Heritage Site: Seocheon, Gochang, Shinan, and Boseong-Suncheon. By 2026, the designation expanded to include six sites in total. These areas were selected under criterion (x) for their exceptional role in the in-situ conservation of biological diversity. They provide essential habitat for 22 IUCN Red List species, including the critically endangered spoon-billed sandpiper, and support a staggering variety of life, including 375 species of benthic diatoms, 118 waterbirds, and 857 macrobenthos.

Despite their protected status as Wetland Protected Areas under the Wetlands Conservation Act, the Getbol face persistent environmental pressures. While land reclamation—the most significant threat—is strictly prohibited within the World Heritage boundaries, other activities such as dredging, bridge construction, offshore wind development, and marine aggregate mining pose ongoing risks. The ecosystem must also contend with broader global challenges, including climate change, coastal pollution, and the potential for oil spills. Protecting these flats is not merely about preserving mud; it is about maintaining a critical link in the survival of migratory species that rely on the Yellow Sea for their long-distance journeys.

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