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Saltwater intrusion in coastal aquifers threatens water security for millions of people worldwide. Mapping and monitoring of saltwater intrusion is crucial for effective groundwater management. In this study, a comprehensive approach to mapping saltwater intrusion is presented, which combines spatial and time-lapse transient electromagnetic (TEM) surveys. A case study was conducted in southeastern Denmark, where changes in the sea level and groundwater recharge have significant impacts on saltwater intrusion. The towed transient electromagnetic system (tTEM) was used to collect the spatial data, while the monitoring TEM (mTEM) system collected the time-lapse data. The tTEM surveys allowed for the spatial resolution of resistivity patterns, while the mTEM instrument permitted monitoring of dynamic processes. The integration of both surveys provides a more accurate and comprehensive understanding of the distribution and movement of saltwater intrusion in the study area.