Yon (river)

{{Short description|River in western France}}

{{Infobox river

| name = Yon

| image =

| image_caption =

| pushpin_map = France#France Pays de la Loire

| source1_location = Saint-Martin-des-Noyers

| source1_coordinates= {{coord|46|42|59|N|01|15|10|W}}

| mouth_location = Lay

| mouth_coordinates = {{coord|46|30|24|N|01|17|28|W|display=inline,title}}

| progression = {{RLay}}

| subdivision_type1 = Country

| subdivision_name1 = France

| length = {{convert|55.6|km|mi|abbr=on}}

| source1_elevation = {{convert|100|m|ft|abbr=on}}

| mouth_elevation = {{convert|5|m|ft|abbr=on}}

| discharge1_avg = {{convert|8|m3/s|cuft/s|abbr=on}}

| basin_size =

}}

The Yon ({{IPA|fr|jɔ̃}}) is a {{convert|55.6|km|mi|abbr=on}} long river in the Vendée département, western France.{{Sandre|id=N34-0300|nom=Yon}} 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.