This dataset includes the causal loop diagrams (CLDs) developed by the H2020 COASTAL project’s MAL #2 for the Social Ecological Land Sea System of Soutwest Messinia. These CLDs were developed as a result of 6 consecutive stakeholder workshops representing the different interest groups in the area (Agriculture, olive oil industry, tourism, fisheries, public administration, NGOs and Research Institutes) aiming in describing the functioning of the territory in a systemic way, highlighting its main components and interactions among them. The CLD's were created using Vensim PLE software and lead to the creation of a Systems Dynamic model for the area.