This proposal aims to conduct a detailed analysis of the System of Environmental-Economic Accounting (SEEA) methodology, outlining its potential application to the case of Mar Menor in Spain. The study will delve into environmental valuation techniques within SEEA, paving the path for a thorough environmental-economic assessment of Mar Menor. Through this work, insights will be gained into the region's ecological and economic dynamics, fostering a holistic understanding crucial for sustainable management strategies.