The Jouanne (French pronunciation: [ʒwan]) is a 58.5 km (36.4 mi) long river in western France located in the department of Mayenne, region of Pays de la Loire.

[1] The name of Jouanne probably goes back to the Gaulish form div-onna (divine-water).

The evolution of Divonne is exactly the same as that of divrnus which engendered day in modern French.

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