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The purpose of this study was to investigate geochemical characteristics of surface sediments in the Keum river estuary adjacent to coastal area. For this study we collected the 21 surface sediments samples. Mean size of surface samples was 3.24~6.65 on inner estuary and was 2.15~3.42 on outside estuary. Surface samples were composed of silt on inner estuary and were composed of sand which was more larger than 4 on outside estuary. Most major elements except CaO, Na2O showed good relationships between variation of contents and grain size. Contents of Al2O3, Fe2O3, MgO, K2O, TiO2, P2O5 and MnO were increased predominately owing to the variation of mean size of surface samples. Contents of Co, Cr, Cu, Li, Sr, Zn, La, Ce, Pb, Rb, Nd have a good relationships with grain size but Ba, Th, Sm have not. All of major and minor elements contents except K2O and Ba were less than world mean contents of shallow surface sediments but apprehend a high pollution possibility on silt sediments in the estuaries.