The Deslioures Biological Reserve is home to one of the most beautiful populations of blue thistles (or queens of the Alps), a rare plant protected at the national level. In summer, the meadows are transformed into a blue-green picture, between butterflies, marmots and alpine silence. A signposted educational trail allows you to better understand the ecosystem of this valley on the edge of the Écrins National Park.

But the Fournel is also a strong human story. Once exploited for livestock and cultivation, the valley remains a pastoral territory, with shepherds who now share the space with hikers and naturalists. The ONF and the National Park coordinate the whole thing to preserve biodiversity.

You can hike on the trails leading to the ridges and lookouts, or try your hand at canyoning in the Fournel canyon, a must for whitewater enthusiasts. And for a cultural touch, don’t miss the Fournel Silver Mine, an impressive testimony to past industrial activity.

Access: from L’Argentière-La Bessée, follow the direction of Le Fournel (car park in summer).
To do: hiking, botanical trail, canyoning, guided tour of the mine.
Best time: June to August for blue thistles.
GPX tracks and practical information about rando.paysdesecrins.com