The decline of freshwater quality in coastal area one of which is caused by the intrusion of seawater inland. The study was conducted to determine the   interface between seawater and freshwater in northern coastal areas of   Ternate island (case study of Kelurahan Kota Baru) using geoelectric method. By compiling the data in certain formats, the data   are  applied to  Res2DinV. The   inversion result  will show an overview  of resistivity distribution of seawater and freshwater.The result shows that the  interface between freshwater and seawater  at Kotabaru coastal areas,  about 28.6 Ωm - 125Ωm.  The interface tends towards the sea, which showed no contamination between  freshwater and seawater, Keywords: Coastal, Interface, Geoelectric
                        
                        
                        
                        
                            
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