MESEA (Maintenance and Exploitation of the South Europe Atlantic High-Speed Line) is a company responsible for the operation and maintenance of the South Europe Atlantic High-Speed Rail Line (LGV SEA), which connects Tours and Bordeaux in France. MESEA ensures the safety, efficiency, and reliability of this 302-km rail infrastructure under a long-term partnership. As a subsidiary of VINCI Concessions and other stakeholders, MESEA focuses on technical upkeep, safety measures, and traffic management for one of Europe's most prominent high-speed rail projects. The company's role supports sustainable mobility and enhances connectivity in the region.