4.6
(183)
2,041
riders
125
rides
Touring cycling routes around Lac D'Ilay traverse a landscape shaped by glacial activity within the Jura Mountains. The region features a network of interconnected glacial lakes, including Lac d'Ilay, often referred to as Lac de la Motte, characterized by its turquoise waters and surrounding cliffs. Cyclists encounter varied terrain, from rolling hills to more challenging segments, with routes often providing views of dense woodlands and the Hérisson River. This area is part of a protected Natura 2000 and Ramsar site, preserving its natural environment.
Last updated: May 25, 2026
4.1
(7)
32
riders
10.2km
00:40
110m
110m
Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
5.0
(4)
62
riders
10.9km
00:42
110m
100m
Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.

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5.0
(3)
14
riders
18.9km
01:14
280m
280m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
14
riders
45.5km
03:23
680m
680m
Hard bike ride. Very good fitness required. You may need to push your bike for some segments of this route.
10
riders
32.1km
02:11
490m
500m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Boat mooring with wooden dock for fishing boats at Lac de Narlay.
6
0
180 m long tunnel through the mountain, requiring a flashlight.
1
0
Lacs de Maclu are two adjacent lakes in the western part of the French Jura, in the Jura department of Franche-Comté. They are located at an elevation of 779 m in a depression in the High Jura, in the region of the Five Lakes near Le Frasnois, about 12 km south of Champagnole. The Petit Maclu, located to the northeast, has an area of 5 hectares, a length of about 500 m, and a maximum width of about 120 m. Its greatest depth is 11 m. It lies entirely within the municipal territory of Le Frasnois.
6
0
Easy, shaded path, perfect for cooling off in hot weather.
0
0
On most maps it is called "Lac d’Ilay". The other name probably comes from the small island "Île de la Motte" which is located in the lake.
1
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Cycle path (mostly unpaved) with a tunnel (drive carefully, not lit) on an old railway line between Foncine-le-Bas and Champagnole. Gravel and stones, but fantastically beautiful in the Gorge de La Saine.
0
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Cycle path (mostly unpaved) with a tunnel (drive carefully, not lit) on an old railway line between Foncine-le-Bas and Champagnole. Gravel and stones, but fantastically beautiful in the Gorge de La Saine.
0
0
Very nice on the way back along the south of the lake
1
0
There are over 120 touring cycling routes around Lac d'Ilay, offering a wide range of options for different skill levels and preferences. You'll find everything from easy lakeside loops to more challenging mountain trails.
The routes around Lac d'Ilay are characterized by their stunning glacial lake landscapes, diverse woodlands, and the varied terrain of the Jura Mountains. Cyclists can enjoy picturesque views of the turquoise waters, imposing cliffs, and lush valleys. The area is also a protected Natura 2000 and Ramsar site, ensuring an unspoiled natural environment.
Yes, there are several easy routes suitable for families. For instance, the Grand Maclu Lake – Lac de la Motte loop from La Fromagerie is an easy 7.0-mile (11.3 km) path that circles Lac d'Ilay (also known as Lac de la Motte) and the adjacent Grand Maclu Lake, offering scenic lakeside cycling. Another easy option is the Lac de la Motte – Petit Maclu Lake loop from Le Frasnois, a 6.8-mile (10.9 km) trail through the glacial lake landscape.
The best time to cycle around Lac d'Ilay is generally from spring through autumn. During these seasons, the weather is more favorable, and the natural beauty of the lakes and forests is at its peak. A voluntary tranquility zone is in place from April 15 to September 15 to protect animal species during breeding season, which also means less disturbance on the trails.
Absolutely. While there are easy routes, the region also offers more challenging options with significant elevation changes. For example, the Scenic Forest Descent – Lac de Narlay loop from Le Frasnois is a difficult 32.1-mile (51.7 km) route with nearly 500 meters of ascent, providing a good test for experienced cyclists.
Yes, many routes around Lac d'Ilay and the surrounding '4 Lakes' are circular, allowing you to start and end at the same point. The Lac du Petit Maclu – Grand Maclu Lake loop from La Chaux-du-Dombief is a popular 7.1-mile (11.4 km) circular route that offers views of two of the region's lakes.
The region is rich in natural beauty. You can look forward to panoramic views from points like Pic de l'Aigle, which offers breathtaking 360° vistas over the Jura Mountains and the Hérisson Valley. The picturesque Rivière du Hérisson, into which Lac d'Ilay flows, is also famous for its impressive waterfalls, providing another natural highlight.
While specific regulations for dogs on cycling trails can vary, the Lac d'Ilay area is a natural environment. It's generally advisable to keep dogs on a leash, especially in protected areas like the Natura 2000 site, to protect local wildlife. Always check local signage for specific restrictions.
The touring cycling routes around Lac d'Ilay are highly rated by the komoot community, with an average score of 4.6 stars from over 190 reviews. Cyclists often praise the stunning lake views, the tranquility of the forests, and the variety of terrain suitable for different skill levels.
While the Jura region has some public transport, direct access to specific trailheads around Lac d'Ilay with bikes might be limited. It's recommended to research local bus services or train connections to nearby towns like Lons-le-Saunier or Saint-Laurent-en-Grandvaux and then plan your cycling route from there, potentially involving a short ride to the lake area.
Parking is typically available in the villages surrounding the lakes, such as La Chaux-du-Dombief, Le Frasnois, or near specific campsites like the Narlay Lake Campsite. These locations often serve as convenient starting points for many of the circular routes. Always look for designated parking areas.
Yes, the area is a hub for various outdoor pursuits. Besides cycling, you can enjoy hiking on trails like the 'tour of 3 lakes / 4 lakes,' mountain biking, and even horse riding. While boating is prohibited in Lac d'Ilay, swimming is tolerated at your own risk in designated areas.


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