Distance: 19.2 km
Level: Mountain bikers
Level: Red level - Difficult
Elevation: 690 D +
Departure: Saint-Geoire-en-Valdaine
MTB markings, circuit n ° 35
In the countryside, In the forest, Pond less than 300 m away, At the water's edge
Recommended period (s): Autumn, Summer, Winter, Spring
Be careful, be careful when crossing the departmental road and when fording on the path up to the Château de Longpra.

By mountain bike

For experienced mountain bikers. After a first long ascent with irregular slopes in the Bois de Servelongue, reach Massieu by a very technical descent. Due to forestry work, prefer the weekend for this circuit!

A second, more regular ascent will bring you to Lake Saint-Sixte.
The shaded surroundings of Lake Saint-Sixte (highest point of the circuit at 700m) will be ideal for recovering before starting a rapid and technical descent in the undergrowth, where you will have to use natural support!

You cross one of the richest natural sites in the Isère department (Natura 2000 zone, stay on the path).

FIELD NEWS (June 2022): development work on forest tracks on Mont Servelongue. For your safety, do not enter the area if construction sites are in progress. Prefer the weekend!

Points of interest

Château de Longpra
Cultural heritage

Longpra Castle

Vente de légumes et de fruits aux Paniers de l’Ainan

Sale of vegetables and fruit at the Paniers de l'Ainan

to report a problem



Free access.

Equipments & services


  • Picnic area.
  • Parking
  • Free parking

Home of animals

  • Animals accepted: not communicated


Our contact details

N°35 – Saint Sixte the lake

Multi-randos station (under the municipal swimming pool)


38620 Saint-Geoire-en-Valdaine

Getting to the starting point