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Itinerary no. 12 "Via the Larina site"

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.

Itinerary no. 12 "Via the Larina site"

Description

This itinerary starts at Blue Valley and explores our region's emblematic landscapes and historical buildings.

Technical Information

Mountainbiking
Difficulty
Hard
Duration
3h30mn
Dist.
63 km
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Altimetric profile

Starting point

Base de loisirs de la Vallée Bleue , 38390   Montalieu-Vercieu
Lat : 45.824313Lng : 5.420771

Points of interest

1 alert
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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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The Caves of La Balme

Small pools, labyrinths, concretions and a lake: the Grottes de La Balme, located 40 minutes from Lyon, are rich in what nature has shaped. Discover a rare and exceptional natural site offering an unusual insight into the underground world!Arrive under this impressive porch and enter the bowels of the cliff to discover labyrinths, an underground lake, stalactites and stalagmites, an amphitheater of small pools... that's what the Grottes de La Balme have to offer. Take your time on a self-guided tour lasting around 1 hour 15 minutes, or take a guided tour (booking required). Visited since 1807, the Grottes de La Balme reveal their history and mysteries as you explore 1,000 meters of underground galleries. Located in the Nord-Isère region, in the center of the village of La Balme-les-Grottes, the caves are an exciting detour in the Balcons du Dauphiné region. Round off your day with a free visit to the Espace Naturel Sensible “Les Coteaux de Saint-Roch”, with its signposted path and discovery booklet. This protected natural area allows you to observe the particular features of the cliffs, forest and dry grasslands surrounding the Grottes de La Balme, home to numerous species of protected plants and animals. Become true adventurers with our 100% family-friendly activities! A playful visit with Archibalme's Investigation: young and old alike will be delighted. Summer and winter alike, the underground world never ceases to amaze! The souvenir store is open at the same time as the caves, and offers a wide range of gifts: crockery, textiles, stones, a selection of books and other must-have items for yourself or as a gift.

Rue des Grottes 38390 La Balme-les-Grottes
- OFFICE DE TOURISME DES BALCONS DU DAUPHINE -
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Additional information

Updated by

Office du Tourisme Les Balcons du Dauphiné - 09/12/2025
www.balconsdudauphine-tourisme.com/
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Environments

In the country

Open period

All year round daily.

Subject to favorable weather.

Type of land

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

Tricky passages

Please be careful when crossing the country roads!

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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! 🌳🥾