This research aims to explore the understanding of preschool teachers in marine content for children in the coastal area of North Maluku. The study focuses on how preschool teachers introduce marine content in children’s play activities. This quantitative descriptive research was conducted in North Maluku with 175 teachers as respondents using a random sampling technique. Data were obtained using a questionnaire. The data revealed that the average understanding of preschool teachers in North Maluku in introducing marine content in children’s play activities is 68%, so it can be categorized at a partial level. It means that not all components of marine content can be introduced to children properly.