The isthmus of Penthièvre is located near Quiberon in Brittany
The isthmus of Penthièvre is a small strip of land and sand that connects the peninsula of Quiberon with the mainland. Without this isthmus, Quiberon would become an island. The visit does not take long. There are beaches where you can swim. The site is interesting but has nothing exceptional. To be seen if you are in the area or if you go to Quiberon.