L'Ain

The Source de l'Ain is a natural spring that emerges from underground caves and creates a clear water stream flowing through limestone formations and forest landscapes. The water surges visibly from the earth and forms a small zone of movement and moisture between stone and trees.

In the 14th century, the region harnessed the spring's power to run foundries in Bourg-de-Sirod, showing how long people have relied on this water for work. Industrial activity at the site grew during later periods of major economic change in Europe.

The spring holds meaning in the stories and traditions of Jura mountain people, who view its waters as special and worthy of respect. Visitors come to experience a place where nature sets the pace and local connection to water remains strong.

Two marked walking trails start from the parking area at Bourg-de-Sirod and lead through the spring's natural setting. The routes are straightforward to follow, and visitors should wear sturdy shoes and bring weatherproof clothing since ground surfaces can be wet and slippery.

The water's behavior shifts dramatically with the seasons: heavy rainfall sends the flow surging upward, while dry periods reveal a deep cavity hidden in the limestone. This change makes each visit feel different and shows how sensitive this natural system is to weather patterns.