Yon (river)

The Yon (French pronunciation: [jɔ̃]) is a 55.6 km (34.5 mi) long river in the Vendée département, western France. Its source is at Saint-Martin-des-Noyers. It flows generally south. It is a right tributary of the Lay into which it flows between Rosnay and Le Champ-Saint-Père.

Yon
Location
Country	France
Physical characteristics
Source
• location	Saint-Martin-des-Noyers
• coordinates	46°42′59″N 01°15′10″W
• elevation	100 m (330 ft)
Mouth
• location	Lay
• coordinates	46°30′24″N 01°17′28″W
• elevation	5 m (16 ft)
Length	55.6 km (34.5 mi)
Discharge
• average	8 m3/s (280 cu ft/s)
Basin features
Progression	Lay→ Bay of Biscay

Communes along its course

This list is ordered from source to mouth:

• Vendée: Saint-Martin-des-Noyers, La Chaize-le-Vicomte, La Ferrière, Dompierre-sur-Yon, La Roche-sur-Yon, Nesmy, Saint-Florent-des-Bois, Chaillé-sous-les-Ormeaux, Le Tablier, Rosnay, Le Champ-Saint-Père