Getbol, Korean Tidal Flats

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Getbol, Korean Tidal Flats: A Unique Coastal Ecosystem of Global Significance

The Getbol, Korean Tidal Flats, comprise a unique and diverse coastal ecosystem along the southwestern, southern, and western coasts of the Republic of Korea. Inscribed as a UNESCO World Heritage Site in 2021 and expanded in 2026, this expansive network of intertidal zones spans across six component parts: Boseong-Suncheon-Yeosu-Goheung Getbol, Shinan-Muan Tandoman Getbol, Muan Hamhaeman Getbol, Gochang Getbol, Seocheon Getbol, and Seosan Getbol.

The Getbol demonstrate a complex interaction between geological processes, ocean currents, sediment movement, and weather patterns that have shaped their coastal environments over thousands of years. These tidal flats are highly dynamic landscapes that are constantly transformed by tidal cycles. Sediments composed primarily of sand, silt, and clay are continuously redistributed by waves, currents, wind, and the activities of living organisms. This ongoing process creates diverse habitats and ecological niches that support a wide range of marine and coastal species.

The component parts of the Getbol represent four major tidal-flat subtypes: estuarine, open embayed, archipelagic, and semi-enclosed tidal flats. Estuarine tidal flats, such as those found in Seocheon Getbol, develop where rivers meet the sea and create areas of high nutrient exchange. Open embayed tidal flats, represented by areas such as Gochang Getbol, occur within broad, shallow bays exposed to tidal processes.

The archipelagic tidal flats of Shinan-Muan Tandoman Getbol consist of extensive intertidal zones surrounding numerous islands, while semi-enclosed tidal flats, including those around Boseong-Suncheon-Yeosu-Goheung, are located in partially enclosed coastal waters. The coexistence of these different tidal-flat systems contributes significantly to the ecological diversity and global importance of the Getbol.

The exceptional biodiversity of the Getbol is one of the primary reasons for its recognition as a UNESCO World Heritage Site. More than 2,150 species of flora and fauna inhabit these tidal flats, including 22 globally threatened or near-threatened species. The ecosystem supports numerous marine invertebrates, including Mud Octopuses (Octopus minor), mud crabs such as Macrophthalmus japonicus, fiddler crabs (Uca lactea), polychaete worms, Stimpson’s Ghost Crabs (Ocypode stimpsoni), Yellow Sea Sand Snails (Umbonium thomasi), and various suspension-feeding shellfish.

These organisms play essential roles in maintaining the ecological functions of the tidal flats by recycling nutrients and supporting complex food webs. The Getbol also provide critical habitat for migratory birds. A total of 118 migratory bird species depend on these tidal flats as important feeding and resting grounds along the East Asian–Australasian Flyway. The abundant invertebrate life within the sediments provides a vital food source for many shorebirds during their long-distance migrations, including several globally threatened species.

Beyond their ecological significance, the Getbol demonstrate the close relationship between geodiversity, biodiversity, and human culture. For centuries, local communities have relied on these tidal flats for food resources, livelihoods, and traditional fishing practices. The Getbol have also influenced local cultural traditions, art, and literature, reflecting the deep connection between coastal communities and their natural environment. Today, they continue to support traditional fishing practices and provide opportunities for ecotourism, offering visitors a chance to witness the beauty and complexity of these unique coastal ecosystems.

The Getbol, Korean Tidal Flats, represent an outstanding example of a globally significant coastal ecosystem. Their exceptional geological features, biological diversity, and cultural importance make them an invaluable natural heritage asset of the Republic of Korea and the world. As coastal environments face increasing pressures from climate change and human activity, protecting and preserving the Getbol is essential to maintaining the ecological processes and biodiversity that have developed within these fragile intertidal landscapes.

UNESCO Description of the World Heritage Site

Situated in the eastern Yellow Sea on the southwestern, western and southern coast of the Republic of Korea, the site comprises six component parts: Boseong-Suncheon-Yeosu-Goheung Getbol, Shinan-Muan Tandoman Getbol, Muan Hamhaeman Getbol, Gochang Getbol, Seocheon Getbol, and Seosan Getbol. The site exhibits a complex combination of geological, oceanographic and climatologic conditions that have led to the development of coastal diverse sedimentary systems. The component parts of the Getbol represent four major tidal-flat subtypes: estuarine, open embayed, archipelagic, and semi-enclosed tidal flats. The site hosts high levels of biodiversity, with reports of 2,150 species of flora and fauna, including 22 globally threatened or near-threatened species. It is home to 47 endemic and five endangered marine invertebrate species besides a total of 118 migratory bird species for which the site provides critical habitats. Endemic fauna includes Mud Octopuses (Octopus minor), and deposit feeders like Japanese Mud Crabs (Macrophthalmus japonica), Fiddler Crabs (Uca lactea), and Polychaetes (bristle worms), Stimpson’s Ghost Crabs (Ocypode stimpsoni), Yellow Sea Sand Snails (Umbonium thomasi), as well as various suspension feeders like clams. The site demonstrates the link between geodiversity and biodiversity, and demonstrates the dependence of cultural diversity and human activity on the natural environment.

UNESCO Justification of the World Heritage Site

Criterion (x): The property contains some of the most important and significant natural habitats for in situ conservation of the outstanding biodiversity of the Yellow Sea region, including a number of threatened and endemic species. Reflecting its habitat diversity (including islands, rocky shores, beaches, sand flats, mud flats and salt marshes), some 2,454 plant and animal species have been recorded. The property encompasses many of the critical stopover sites for several globally threatened species of migratory birds, along the EAAF, one of the world’s most important yet jeopardized flyways. Many of the estimated 50 million waterbirds of the EAAF depend on the Yellow Sea’s coastal wetlands to stage on their annual migration between nesting areas in eastern Asia to as far north as Siberia and Alaska, and non-breeding areas to as far south as Australasia. The property supports a total of 216 bird species, among which are 114 waterbird species, 44 shorebird species and 24 globally threatened species. There are also 16 migratory waterbird species that at times have over 1% of their global population in the property. The remarkable concentrations of migratory waterbirds using the six component parts include important numbers of globally threatened species and species limited to the EAAF. These include the Spoon-billed Sandpiper; Far Eastern Curlew; Black-faced Spoonbill; Great Knot; Nordmann’s Greenshank; Hooded Crane; Saunders’s Gull; and Chinese Egret. The property also supports 114 species of fish and two species of marine mammals as well as an exceptional diversity of tidal flat organisms including 472 benthic diatom species, 170 macroalgae species, 123 halophyte species and 1,349 species of macrobenthos. 53 of the tidal flat species are endemic to the Yellow Sea.

Encyclopedia Record: Getbol, Korean Tidal Flats

Getbol (Korean: 갯벌) are mudflats, or tidal flats, coastal sedimentary systems. They are important habitats for different types of organisms, including migrating birds and marine fauna such as clams, crabs, octopuses, and snails. In 2021, four getbol sites in South Korea were listed as a UNESCO World Heritage Site due to their outstanding natural properties, with an extension in 2026 resulting in the listing of six sites in total. Each of these sites represent a different type of getbol (estuarine type, open embayed type, archipelago type, and semi-enclosed type).

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IUCN World Heritage Outlook

The 2025 Conservation Outlook on Getbol, Korean Tidal Flats reports the following assessment:

Source: International Union for Conservation of Nature (IUCN) · View assessment