Gorges de l'Areuse, Switzerland The Val de Travers is a Jura mountain valley perpendicular to the main valleys (hence the name). The river Areuse has cut itself steeply through the soft limestone and clay sediments. It's one of those Roman bridges too.
The Verdon Gorge, France is about 25 km long and up to 700 metres deep. It was formed by the Verdon River, which is named after its startling turquoise-green colour, one of the canyon's most distinguishing characteristics.