The valley has a fascinating geological basis, with the local mountains being very much older than the surrounding Alps.  The local rock is predominantly limestone but there are also large areas of acid soils. On the higher alpine shelf, which lies behind and above Chalet Marion, there are massive limestone pavements, which are some of the largest in Europe.

There are many miles of signposted walks for soaking up the mountain air, also mountain biking, parascending and hang-gliding for the more adventurous types!