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From the refuge, or during the climb, a peculiar geological formation may catch your eye on the opposite bank, above the old hamlet of Peines. Sedimentary rocks are trapped in the middle of crystalline formations where erosion has created a specific pattern of erosion that looks like a giant tiger has clawed at the rock. This morphology is what gave it the name Arraches.

During your walk, you might come across sheep on the mountain pastures. This is an old form of pastoralism, as proven by the dry stone enclosures that you will see. These are known as 'jas'. You will also notice a rock shelter near to the Clot. The sheep that are in these pastures belong to breeders from the valley or from the Bas Champsaur area.

The upper limit of the forest is where you are likely to see the black grouse. The female has faith in her bland-coloured feathering that camouflages her in the vegetation, making her difficult to spot. On the other hand, the male, which is black and white with red "eyebrows”, is not so private, particularly during the reproduction season when their cooing and hissing sounds echo in the mountain in the early morning.

This walk is a summary of south facing slopes in the Valgaudemar area. It starts in the warm scree that it more or less vegetated. It then progresses over lawns and moors of juniper, blueberries or bearberries... They give way to mountain ash, whitebeam and amelanchiers indicating that the forest will soon take over. Higher up, the beech forest casts shade on the walkers, next a beautiful larch forest is a sign that the forest environment will give way to the high altitude moors and lawns. The Lautier lake and the surrounding ponds are a haven for aquatic species. Still higher, is the realm of rocks and chamois.

There is a large variety of plant life along the itinerary, particularly on the slopes above the refuge, due to the exposure, the soil types and the altitude. Marjoram, lis, laserwort, houseleek, stinecrop, gentian, columbine, aconite and many others are present.