The Arz ( br, Aer) is a long river in the

Morbihan Morbihan ( , ; br, Mor-Bihan ) is a department in the administrative region of Brittany, situated in the northwest of France. It is named after the Morbihan (''small sea'' in Breton), the enclosed sea that is the principal feature of the coastli ...

département In the administrative divisions of France, the department (french: département, ) is one of the three levels of government under the national level ("territorial collectivity, territorial collectivities"), between the regions of France, admin ...

'', northwestern France. Its source is at

Plaudren Plaudren (; br, Plaodren) is a commune in the Morbihan department and Brittany region of north-western France. In French the inhabitants of Plaudren are known as ''Plaudrinois''. Geography The river Arz has its source in the commune. See als ...

. It flows generally east-southeast. It is a

right tributary A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage ...

of the

Oust The Oust (; br, Oud) is a river in Brittany, France, right tributary of the Vilaine. It is long. Its source is in the hills between Corlay and Quintin. It flows generally southeast, through the following ''départements'' and towns: * Côtes ...

into which it flows at

Saint-Jean-la-Poterie Saint-Jean-la-Poterie (; ) is a commune in the Morbihan department of Brittany in north-western France. Geography The river Arz forms part of the commune's northern border, then flows into the Oust, which forms most of its eastern boundary. De ...

, near

Redon Redon (; ) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France. It is a sub-prefecture of the department. Geography Redon borders the Morbihan and Loire-Atlantique departments. It is situated at the junction of t ...

Communes along its course

This list is ordered from source to mouth:

Monterblanc Monterblanc (; br, Sterwenn) is a commune in the Morbihan department and Brittany region of north-western France. Geography The river Arz forms most of the commune's northern border. Demographics In French the inhabitants of Monterblanc are ...

, Elven,

Le Cours Cours (; br, Ar C'hour) is a commune in the Morbihan department of Brittany in north-western France. Geography The river Arz forms all of the commune's southern border. Demographics Inhabitants of Le Cours are called in French ''Coursiens' ...

, Larré,

Molac Molac (; br, Moulleg) is a commune in the Morbihan department of Brittany in north-western France. Geography The river Arz forms most of the commune's south-western border, then flows eastward through the south-eastern part of the commune. Mo ...

Pluherlin Pluherlin (; br, Pluhernin) is a commune in the Morbihan department of Brittany in north-western France. Geography The river Arz flows eastward through the commune. The northern part of the commune belongs to a forest covered area called in f ...

Malansac Malansac (; br, Malañseg) is a commune in the Morbihan department of Brittany in north-western France. Geography The river Arz forms all of the commune's northern border. Map Demographics Inhabitants of Malansac are called in French ''Ma ...

Saint-Gravé Saint-Gravé (; br, Sant-Gravez) is a commune in the Morbihan department of Brittany in northwestern France. Geography The canal de Nantes à Brest forms part of the commune's northern border; the river Arz forms all of its southern border. D ...

Peillac Peillac (; br, Paolieg; Gallo: ''Peilla'') is a commune in the east of Morbihan department of Brittany in north-western France. Geography The canal de Nantes à Brest forms all of the commune's northern border; the river Arz forms all of its ...

, Saint-Jacut-les-Pins,

Saint-Vincent-sur-Oust Saint-Vincent-sur-Oust (, literally ''Saint-Vincent on Oust''; ) is a commune in the Morbihan department of Brittany in north-western France.

, Allaire,

Saint-Perreux Saint-Perreux (; ) is a commune in the Morbihan department of Brittany in north-western France. It was named after the Welsh monk, Saint Petroc. Geography The river Arz forms most of the commune's western and south-western borders, then flows ( ...

References

Rivers of France Rivers of Brittany Rivers of Morbihan {{France-river-stub