Nantes to Brest canal

The Ninian (French: le Ninian) is a river in Brittany, France. Its length is 60 km (37 mi). Its main tributaries are the Trelan (at Mohon), the Léverin (at Taupont), the Yvel (at Ploërmel) and the Guerfo. It flows into the Oust near to Montertelot.

Montertelot (Breton: Mousterdelav) is a commune in the Morbihan department in Brittany in north-western France.It is situated between the cities of Rennes and Vannes, about 6 km from Ploërmel.

Le Roc-Saint-André (Breton: Roz-Sant-Andrev) is a former commune in the Morbihan department of Brittany in north-western France. On 1 January 2016, it was merged into the new commune Val d'Oust.

Val d'Oust is a commune in the Morbihan department of western France, named after the river Oust. Le Roc-Saint-André is the municipal seat. The municipality was established on 1 January 2016 and consists of the former communes of Le Roc-Saint-André, Quily and La Chapelle-Caro.