| Jouanne | |
| Map: | Jouanne.png |
| Source1 Location: | La Hardière |
| Mouth Coordinates: | 48.2303°N -0.3911°W |
| Subdivision Type1: | Country |
| Length: | 58.5km (36.4miles) |
| Source1 Elevation: | 172m (564feet) |
| Basin Size: | 422km2 |
The Jouanne (in French pronounced as /ʒwan/) is a 58.5km (36.4miles) long river in western France located in the department of Mayenne, region of Pays de la Loire. It is a tributary of the river Mayenne on the left side, and so is a sub-tributary of the Loire by Mayenne and Maine.
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.[1]