This course examines the important role of maritime affairs in contributing to the development of the Indonesian state by restoring the sea as a sustainable development agenda, building maritime cultural character through education, discussing maritime boundaries, diplomacy using territorial and geospatial data approaches, exploring local wisdom about maritime and maritime affairs. Through this maritime study, it is hoped that it will be able to support the realization of national security that can maintain territorial sovereignty, support economic independence by securing maritime resources, and reflect Indonesia‘s personality as an archipelagic country.