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Route n°11 Les Gorges de Verbois

1 alert on this circuit

ESPACE NATUREL SENSIBLE DE L’ÉTANG DE LEMPS:

Alerte visiteurs

Vous pénétrez dans un Espace Naturel Sensible, véritable refuge pour de nombreuses espèces animales et végétales.

Afin de préserver la tranquillité des lieux, veillez à rester discret et à limiter le bruit. Restez sur les sentiers balisés, ne laissez aucun déchet et ne cueillez ni fleurs ni plantes.

Route n°11 Les Gorges de Verbois

Description

This mountain-bike itinerary takes you to the Environmentally Sensitive Area of Lemps Lake and also visits the Verbois Gorges.

Technical Information

Mountainbiking
Difficulty
Medium
Duration
6h
Dist.
56 km
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Altimetric profile

Starting point

Base de loisirs de la Vallée Bleue , 38390   Montalieu-Vercieu
Lat : 45.824249Lng : 5.420782

Points of interest

1 alert
image du object

Etang de Lemps sensitive natural area

Situated between Optevoz and Saint-Baudille-de-la-Tour, the Étang de Lemps is an iconic Sensitive Natural Area in the Isle-Crémieu region. This 23-hectare protected site is home to a remarkable diversity of wildlife in the heart of the Nord-Isère wetlands.Having changed little since the 18th century, this site is subject to environmental management and scientific monitoring designed to preserve the exceptional richness of its natural habitats. Reed beds, ponds, wet meadows, dry meadows, hedgerows and limestone hillsides form a mosaic of habitats that are home to remarkable biodiversity. Twelve heritage habitats have been identified here, including eutrophic standing waters and extensive reed beds, which serve as true refuges for aquatic wildlife. The flora comprises 457 plant species, including 14 heritage species. Throughout the seasons, visitors can see wild orchids, the loose-flowered orchid, the marsh orchid, water germander, southern bladderwort, common adder’s-mouth and Amelle aster, all of which bear witness to the ecological richness of this wetland. The wildlife is equally remarkable. The pond is home to 130 species of birds, including the Little Bittern, the Kingfisher, the Reed Bunting and various types of Reed Warbler, which find the reed beds an ideal place to feed, breed or stop off during their migration. The terrestrial habitats are also home to numerous amphibians and reptiles, as well as heritage insects such as the green damselfly and the stag beetle. A real window onto nature, the birdwatching hide allows visitors to observe wildlife without disturbing it. Situated on the edge of the reedbed, it offers a prime vantage point for watching waterbirds and aquatic life all year round. Depending on the season, you can witness bird migrations, observe breeding species or spot those that simply stop off at the pond. An educational wheel installed in the observatory helps visitors identify the species present depending on the month of their visit, making each visit a different experience. With a little patience and a pair of binoculars, dragonflies, herons, kingfishers and many other species reveal themselves to the most observant visitors. You can explore the Étang de Lemps along an educational trail featuring nine information points that explain how wetlands work, water management, the landscapes of Isle-Crémieu, and the close links between the various natural habitats and the species that inhabit them. For a more interactive experience, two orienteering trails are also available on the site: one for adults and one for children. Each trail is 3.6 km long and features eight checkpoints; they follow the same route but include questions tailored to each age group. It’s an original way to explore the Étang de Lemps, taking in its natural heritage whilst enjoying a family challenge.

Rue du Grivoux 38460 Optevoz
- Isere Tourisme -
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Additional information

Updated by

Office du Tourisme Les Balcons du Dauphiné - 14/10/2026
www.balconsdudauphine-tourisme.com/
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Environments

In the country

Distinctions

Label VTT - FFC

Open period

All year round.

Subject to favorable weather.

Type of land

Stone
Ground
Hard coating (tar, cement, flooring)
Grit

Contact

Phone : 04 74 88 49 23

Email : contact@valleebleue.org

Website : https://www.openrunner.com/route-details/4604467

Tricky passages

Be careful when crossing the country roads!

Data author

Ratings and reviews

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Caution!
We have no information on the difficulty of this circuit. You may encounter some surprises along the way. Before you go, please feel free to inquire more and take all necessary precautions. Have a good trip! 🌳🥾