The Arc (French pronunciation: [aʁk] ⓘ) is an 83-kilometre (52 mi) long river in Southern France.

[1] It arises at an elevation of 470 metres (1,540 ft), close to the village of Pourcieux.

It then passes through Aix-en-Provence before flowing into the Étang de Berre, a lagoon connected with the Mediterranean Sea to the west of Marseille.

Its drainage basin, with a surface area of 716 square kilometres (276 sq mi), is divided between two departments, Var and Bouches-du-Rhône.

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