One of the oldest nature reserves in France (first delineated in 1927 and given official protected status in 1975), it covers 132 sq km of wetlands, lagoons, islands, peninsulas and the vast 600-sq-km Étang de Vaccarès. There's an information centre at La Capelière and the website has useful maps detailing recommended birdwatching areas and balades naturalistes (nature walks).