Cascades du Hérisson
Forest & waterfalls — nature hike
The Hérisson is a highland Jura river tumbling through 31 waterfalls across just 4 km between the lakes of Ilay and Bonlieu. A marked forest trail follows the falls — from l'Éventail up to the Grand Saut, the tallest waterfall, deep in a beech and fir forest.
What awaits you
You hear the water before you see it. The forest cools the air immediately. Then the Grand Saut appears around a bend in the trail — stunning, every season.
At a glance
- Best season
- Spring (high water, leafy forest) and autumn (colours, fewer crowds). Summer works too — the trail is manageable with children.
- Ideal duration
- Comfortable half-day (round trip 3h including rest). Full day if you combine with Lac d'Ilay.
- Ideal for
- Hikers, families, nature lovers, photographers, active travellers.
- Distance
- Approximately 35 km from Lons-le-Saunier
Why stay at Lons Séjours
Allow half a day to a full day depending on your pace. Our Perrigny apartments, with the greenway at the door, are the perfect active base: cycling in the morning, waterfall hike in the afternoon.
View apartments →What to do
Waterfalls trail
4 km one way between Bonlieu and Ilay — 31 waterfalls including l'Éventail, l'Hérisson and the Grand Saut (65 m). Marked GR trail, moderate elevation gain. About 2h one way.
Grand Saut
The main waterfall, 65 m high, deep in the forest. A dedicated viewpoint lets you get close. Natural turnaround point for half-day walks.
Lac d'Ilay
At the top of the trail, Lake Ilay (785 m altitude) offers views over the Jura forest — ideal for a picnic break.
Swimming at Lac de Bonlieu
At the lower trailhead, Lac de Bonlieu offers a swim before or after the hike. Free access, calm waters.
Practical info
- Getting there
- Car essential. Parking at Bonlieu (lower start, recommended) or Ilay (upper start). No public transport.
- Tip
- Arrive early in summer — Bonlieu car park fills up on weekend mornings. Hiking boots required (rocks, mud). Bring water and a packed lunch.
Combine with
Continue to Lac de Chalain (20 min from Bonlieu) for an afternoon swim, or detour through Baume-les-Messieurs on your way back.
In bad weather
The waterfalls are even more spectacular in rain — powerful flow and dramatic mist. The trail gets slippery: waterproof boots and a rain jacket are essential. In heavy rain, stay on the built viewpoint platforms and keep back from the rock edges near the falls.
Plan your stay in Lons
Book directly, no platform fees. Describe your stay and receive a response within 2 hours on weekdays.