The Siagne (French pronunciation: [sjaɲ]; Occitan: Sianha) is a river that flows through the Var and Alpes-Maritimes departments of southeast France. It is 44.5 km (27.7 mi) long. For much of its length, it forms the border between the two departments. Its drainage basin is 512 km² (198 sq mi). 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.