オルドナーズの天然記念物・トップ5

とても美しいコースで、きっと気に入るでしょう

The site includes several waterfalls, the main one being 32 meters high. Simply magnificent. https://cascadesdefrance.fr/listing/cascade-des-dards-cheignieu-la-balme-ain/

Located near Artemare, the Cerveyrieu waterfall is impressive with its wide curtain of water cascading down from a limestone cliff. This site, classified as a "sensitive natural area," is ideal for a break.

A very beautiful view of the valley and an impressive waterfall!

La Roche Percée, near Colomieu, is a must-see highlight on your mountain bike route. It features a striking natural arch carved into the rock, surrounded by dense forest. As you hike along forest trails, you’ll suddenly come across this stunning formation, where you can pause to appreciate this unique geological feature and the panoramic views of the valley beyond.

Lake Ambléon is located in the Bas-Bugey massif, in a valley of the Tentanet mountain (712 m above sea level). Its area is 5.58 hectares. Recognized as a natural zone of ecological, fauna and flora interest (ZNIEFF) type I, it is made up of a marshy part and a deeper zone, which however does not exceed ten meters in depth Lake Ambléon, accessible by the D41 road which connects Ambléon to Lhuis, is frequented in summer by fishermen and walkers. Nearby a stele was erected in memory of the Ambléon maquis. Source: Wikipedia

Here you have a direct view of the waterfall. Park your bike by the bridge. There's also an information board there.

The rock of this natural tunnel is limestone. It was erosion that made it possible to pierce the rock and thus created a window that was, to say the least, original.