An Inland Salt Anomaly
The Janghangsaneseupji Saline Wetland presents a geological puzzle: a salt marsh ecosystem existing without a connection to the modern sea. Its salinity originates from ancient seawater trapped within layers of sediment. This phenomenon occurs in depressions where saline groundwater seeps to the surface. Over long periods, evaporation concentrates the salts in the soil and water, since local evaporation rates exceed the input from rainfall and runoff. The water source is entirely non-tidal, distinguishing it from typical coastal salt marshes.
The geological history of the Buan region, part of the Jeonbuk West Coast National Geopark, provides the context for this formation. The area has a complex series of rocks, with foundations of Precambrian metamorphic rock, intrusions of Jurassic-era granite, and extensive layers of volcanic and sedimentary rock from the Cretaceous period (145 to 66 million years ago). During periods of geologic activity and changing sea levels, pockets of marine water and salt-rich sediments became isolated inland. This trapped brine, percolating through the ground, now emerges at the surface, creating the saline conditions that define the wetland. The soil salinity can exceed 18 parts per thousand, creating a chemical environment hostile to typical freshwater plants.
Life Adapted to Ancient Salt
The high concentration of salt in the soil dictates what can survive at Janghangsaneseupji. The flora is dominated by halophytes, or salt-tolerant plants, which are typically found on coastlines. Species common to such environments include Glasswort (Salicornia europaea) and Seablite (Suaeda maritima). These plants have developed specific adaptations to thrive where others cannot. Many are succulents, retaining water in their fleshy stems and leaves to cope with the desiccating effect of the saline soil. Others excrete excess salt through specialized glands.
This unique habitat supports a community of organisms that is displaced from the coast. The invertebrate life, from insects to crustaceans, consists of species whose closest relatives live in tidal flats and coastal estuaries. This biological community is a direct consequence of the area's geochemistry. The wetland shows how ancient geological events continue to shape distinct ecosystems today. The result is a area of sparse, specialized vegetation, often interspersed with bare patches where salt crystallizes on the surface.