The coast is the interface between the land and the sea. It is characterized by a huge diversity of social-ecological systems and the interdependent interactions and outcomes between social and ecological subsystems. Access to and therefore the usability of marine space is increasing substantially, including the types of resources and technologies used to harvest and monitor them. The desire to exploit the sea, might it be for providing the world with required protein through fisheries and aquaculture, or to put claims on resources believed to be valuable in the near future, is expanding at a great speed. The scientific community is well aware of the particular role and complexity of the coastal realm and the land-sea interaction. In the coastal commons a huge variety of diverse resource systems are interacting. These include forests, water, pastures, beaches, estuaries and fish, just to name a few.