The Finnish Archipelago Sea faces severe eutrophication due to agricultural runoff, harming its marine ecosystems. To address this issue, two case studies examine both local river basin management in the Archipelago and the broader Baltic Sea region. These studies focus on how the Water Framework Directive (WFD) and Marine Strategy Framework Directive (MSFD) align with agricultural, aquaculture, and offshore wind policies. By understanding these interactions, it becomes possible to pinpoint governance gaps, enhance policy coherence, and better protect this vulnerable environment.