Cascade d'Ars

Cascade d'Ars is one of the most striking waterfalls in the Pyrenees, tucked into the forested slopes above the village of Aulus-les-Bains, in the Ariège department of southern France's Couserans area. It sits inside the Regional Nature Park of the Ariège Pyrenees and has long been a magnet for hikers looking for one of the region's grandest mountain views.

How tall is Cascade d'Ars?

The water drops a total of around 246 metres in three successive stages carved into the rock face. The first tier measures roughly 90 metres, while the largest and most dramatic single drop reaches about 110 metres. The falls sit at an altitude of roughly 1,380 metres, framed by a forest of beech and silver fir that shades the approach in summer and turns color in autumn. Many regional guides describe it as the tallest waterfall in the Pyrenees. The 19th-century Pyrenean explorer Henry Russell reportedly called it the most beautiful waterfall in the whole range, a line still repeated in descriptions of the site today.

How do you get there?

The hike starts right in the village of Aulus-les-Bains. The path first follows the Garbet river before climbing into the valley of the Ars river, which it traces all the way to the base of the falls. Reaching the foot of the waterfall and returning to the village typically takes 3.5 to 4 hours round trip, and the walk is considered manageable for families, though sturdy shoes are recommended since the trail can turn rocky and slippery after rain. Hikers who want to reach the top of the cascade should plan for roughly 2 hours one way. A longer loop that links the waterfall with the nearby Étang de Guzet lake stretches to about 11 kilometres with 880 metres of elevation gain, taking 4.5 to 5 hours and rated as more demanding.

When is the best time to visit?

The waterfall is at its most powerful in spring, particularly at the end of May and through June, when snowmelt feeds the river. By August, flow can drop by 40 to 50 percent compared with June, so the cascade appears noticeably thinner in high summer, even though the forested approach remains scenic year-round.

What else is worth seeing nearby?

Many hikers extend the day by continuing up to the Étang de Guzet, a mountain lake above the falls, combining two signature sites of this corner of the Pyrenees into one full-day outing. The village of Aulus-les-Bains itself, known for its thermal spa tradition, makes a convenient base for this hike and for other trails through the Couserans area.

Frequently Asked Questions

How long does the hike to Cascade d'Ars take? Walking to the base of the waterfall and back to Aulus-les-Bains generally takes 3.5 to 4 hours. Continuing to the top of the falls adds further time to the round trip.

Is the trail suitable for families? The walk to the foot of the cascade is considered accessible for families, though the path can be rocky and slippery, especially after rain, so solid footwear is worth bringing.

When does the waterfall carry the most water? Late May and June, during the peak of mountain snowmelt, offer the strongest flow. By August the volume of water is typically much lower.

Where does the trail begin? The hike starts in the village of Aulus-les-Bains in the Ariège department, following the Garbet and then the Ars river valleys up to the falls.