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Aigues-Mortes (Occitan: Aigas Mòrtas,) is a French commune in the Gard department in the Occitainie region of southern France.

The medieval city walls surrounding the city are well preserved.

Aigues-Mortes is located in the Petite Camargue some 90 km (56 miles) north-west of Marseilles. By road, Aigues-Mortes is about 33 km (21 miles) south-west of Nîmes, and 20 km (12 miles) east of Montpellier in a direct line. Access to the commune is by route D979 coming south from Saint-Laurent-d'Aigouze to Aigues-Mortes town. Route D979 continues south-west through the commune to Le Grau-du-Roi. Route D62 also starts from Aigues-Mortes heading south-west parallel to D979 before turning eastwards and forming part of the southern border of the commune. Route D62A continues to Plan d'Eau du Vidourie. The commune is composed of a portion of the wet plains and lakes of the Petite Camargue. It is separated from the Gulf of Lions (and, thus, the Mediterranean) by the town of Le Grau-du-Roi however Aigues-Mortes is connected to the sea through the Canal du Rhône à Sète. There is only one other hamlet in the commune called Mas de Jarras Listel on the western border. The Canal du Rhône à Sète enters the commune from the north-west and the north-east in two branches from the main canal to the north and the branches intersect in the town of Aigues-Mortes before exiting as a single canal alongside route D979 and feeding into the Mediterranean Sea at Le Grau-du-Roi.

A rail branch line from Nîmes passes through Aigues-Mortes from north-east to south-west, with a station in the town of Aigues-Mortes, to its terminus on the coast at Le-Grau-du-Roi. This line also transports sea salt.

The communes of Saint-Laurent-d'Aigouze and Le Grau-du-Roi are adjacent to the town of Aigues-Mortes. Its inhabitants are called Aigues-Mortais or Aigues-Mortise; in Occitan they are aigamortencs.

Aigues-Mortes is one of 79 member communes of the Schéma de cohérence territoriale (SCoT) of the South of Gard and is also one of 34 communes in the Pays Vidourle-Camargue. Aigues-Mortes is one of the four communes of the Loi littoral (fr) of SCoT in the South of Gard.