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This application paper demonstrates the capabilities of multispectral remote sensing images on detecting oil spills and underwater natural oil outflows in oil potential areas. An object based method for oil spill detection using high or very high multispectral images has been developed. The method exploits the knowledge provided by the systematic photo-interpretation of the temporal, spectral and spatial features of the high or very high resolution multispectral datasets. The developed method has been proved to work well in very high resolution satellite images such as IKONOS, QuickBird, RapidEye, and WorldView2, as well as high resolution satellite images (Landsat TM). When repeatedly applied on sequential multispectral imagery, the developed method can reveal potential natural underwater oil outflows. A large unknown systematic natural oil outflow near the Zakynthos island (Greece) has been discovered and served as the best proof for the evaluation of the developed oil spill detection method.