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Estuaries are connecting pathways where terrestrial carbon is transported to the ocean and environments where various biogeochemical cycles occur. It is essential to estimate the carbon flux across the land-sea continuum to accurately determine the global carbon budget. Additionally, understanding the carbon characteristics of estuarine environments provides valuable information for watershed management and coastal ecosystem conservation. This paper introduces research results in Korea regarding the organic carbon cycle in estuarine environments. In particular, it focuses on research results concerning organic carbon characteristics using stable and radioisotopes, and, based on this, suggests directions for future study. [ABSTRACT FROM AUTHOR]