Purirano Subdistrict is a coastal area in Kendari City with a strong connection to the sea in terms of social, economic, and daily community activities. Along with the increasing domestic activities and utilization of coastal areas, the issue of marine debris has begun to emerge, potentially disrupting ecosystems and environmental comfort. This community service activity aims to educate coastal residents about the importance of maintaining marine cleanliness through visual media such as posters and billboards. Posters were distributed directly to residents’ homes, while billboards were installed in strategic locations to be visible to the broader community. The results of the activity indicate that visual media can effectively attract public attention and deliver educational messages. The distributed posters received positive responses from residents, while the billboards served as strong visual reminders in daily life. This method is considered efficient in raising awareness without requiring intensive direct interaction. This activity is expected to serve as an initial step toward behavioral change among coastal communities in protecting the marine environment sustainably.