The Siagne (French pronunciation: [sjaɲ]; Occitan: Sianha) is a river that flows through the Var and Alpes-Maritimes departments of southeast France.

[1] For much of its length, it forms the border between the two departments.

[2] Its source is near Escragnolles, flowing southeast, through Saint-Cézaire-sur-Siagne and Pégomas, and into the Mediterranean Sea in Mandelieu-la-Napoule, 5 kilometres (3 mi) west of Cannes.

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