The Siagne (; ) is a river that flows through the Var and Alpes-Maritimes departments of southeast France. It is long. For much of its length, it forms the border between the two departments. Its drainage basin is .Bassin versant : Siagne (La), Observatoire Régional Eau et Milieux Aquatiques en PACA Its source is near Escragnolles, flowing southeast, through Saint-Cézaire-sur-Siagne and Pégomas, and into the Mediterranean Sea in Mandelieu-la-Napoule, west of Cannes.
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