Arz (river)

{{Short description|River in France}}

{{Infobox river

| name = Arz

| image =

| image_caption =

| pushpin_map = France#France Bretagne

| source1_location = Plaudren

| source1_coordinates= {{coord|47|44|35|N|02|43|52|W}}

| mouth_location = Oust

| mouth_coordinates = {{coord|47|39|21|N|02|06|40|W|display=inline,title}}

| progression = {{ROust}}

| subdivision_type1 = Country

| subdivision_name1 = France

| length = {{convert|66.4|km|mi|abbr=on}}

| source1_elevation = {{convert|130|m|ft|abbr=on}}

| mouth_elevation = {{convert|2|m|ft}}

| discharge1_avg = {{convert|2.26|m3/s|cuft/s|abbr=on}}

| basin_size = {{convert|270|km2|sqmi|abbr=on}}

}}

The Arz ({{langx|br|Aer}}) is a {{convert|66.4|km|mi|abbr=on}} long river in the Morbihan département, northwestern France.{{Sandre|id=J88-0300|nom=Arz}} Its source is at Plaudren. It flows generally east-southeast. It is a right tributary of the Oust into which it flows at Saint-Jean-la-Poterie, near Redon.