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For the airport in Bhutan, see Yongphulla Airport.
Origin Saint-Martin-des-Noyers
46°42′59″N 01°15′10″W / 46.71639°N 1.25278°W / 46.71639; -1.25278
Mouth Lay
46°30′24″N 01°17′28″W / 46.50667°N 1.29111°W / 46.50667; -1.29111Coordinates: 46°30′24″N 01°17′28″W / 46.50667°N 1.29111°W / 46.50667; -1.29111
Basin countries France
Length 55.6 km (34.5 mi)
Source elevation 100 m (330 ft)
Mouth elevation 5 m (16 ft)
Avg. discharge 8 m3/s (280 cu ft/s) at mouth

The Yon 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.

Communes along its course[edit]

This list is ordered from source to mouth: