his review explores the green synthesis of silver nanoparticles (AgNPs) from natural resources and their potential as disinfectants, highlighting the relevance of coastal bioresources, including mangroves and algae, to nanomaterial development. It connects coastal biodiversity with green nanotechnology through naturally occurring compounds that facilitate nanoparticle formation and stabilization. Its discussion of antibacterial properties and water disinfection provides a foundation for future research on coastal water quality management, while ecosystem benefits and safety for aquatic organisms require further evaluation.