A marine monitoring partnership between rangers and scientists was established in 2018 in the Kimberley region of northwestern Australia to support the Bardi Jawi people in managing the health of their sea Country. The partnership has: (1) focused on building strong relationships, (2) developed a tailored sampling program that integrates Traditional Ecological Knowledge with Western science methods, (3) involved rangers in every stage of the process—collecting, interpreting, and sharing monitoring data with their community, and (4) continuously adapted to emerging needs such as monitoring for coral bleaching. These efforts have enabled the Bardi Jawi Rangers to take a self-determined approach to marine monitoring in their sea Country, giving them access to fish and habitat datasets that inform resource management within their Indigenous Protected Area. We present key insights of our outcomes eight years into the program, across science, community engagement, education, and capacity building. For example, we have applied a Bayesian approach to understand and communicate uncertainty in fish population trends, co-delivered a school education program, evaluated differences in customary fisheries target species across mangrove and coral reef habitats, incorporated ongoing coral bleaching monitoring critical to understanding impacts on fish communities and potential for local bleaching refugia, and contributed meaningfully to the design and establishment of local marine parks. Looking ahead, we are committed to ongoing capacity building within the ranger team, supporting them to lead monitoring efforts, interpret and communicate data trends, and develop research projects that address the many scientific questions emerging from long-term monitoring. This work has been a pioneer in Indigenous-led monitoring and research and was instrumental in the creation of the Northern Australian Marine Monitoring Alliance (NAMMA).