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Several countries in the Gulf of Guinea have economies based on the extraction of raw materials, particularly oil. This oil extraction is not without consequences for marine and coastal ecosystems. Marine pollution from hydrocarbons is one of the factors affecting marine areas. A better understanding of this environment makes it possible to assess the impact of an oil spill on the environment or to study the effects of chronic pollution linked to shipping lanes, ports, oil platforms, oil pipelines or refineries. It is essential that oil spill detection and monitoring systems respond rapidly to contain these risks. This is why we believe that the use of remote sensing appears to be a promising avenue for detecting oil slicks at sea. The aim of this study is to propose a methodological approach to identify the presence of oil slicks at sea from 2015 to 2020 using radar images from the Sentinel-1 satellite. Our approach enabled us to map all oil slicks and subsequently calculate the areas where the oil and any oil spills had spread. The results clearly show that the Congo region is prone to frequent oil spills. Keywords: oil slick, pollution, remote sensing, sea, cartography