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The potential of Indonesia's coastal and marine areas is mainly based on both capture and aquaculture resources. This necessitates the need for development of aquaculture suitable areas for improved utilization of the coastal space. The aquaculture suitability of the coastal area of Karampuang Island is related particularly to the cultivation of sea cucumbers, seaweed, and floating net cages for fish farming. Thus, this research aimed to develop a unified suitability mapping approach for coastal aquaculture activities and to optimize the profitability of the coastal areas. The method involved the use of environmental data for the suitability matrix data application. The study recorded highly suitable areas for sea cucumber cultivation in the northern and southeastern parts of Karampuang Island, while the potentially suitable areas for seaweed cultivation were found to be located in the southwestern and southeastern parts. The areas suitable for floating net cages for fish farming were in the northern and western parts of the Island. The results of this study can be used to expand blue economy activities and maximize the utilization of coastal space for aquaculture production.