High mountain gave from source to Lac des Gloriettes, tumbling through ~5 km of protected no-kill stretch — the longest in the Hautes-Pyrénées. Fly-only, barbless regulation protects pristine conditions. Wild brown trout in alpine freestone. Spectacular granite terrain with technical pocket-water fishing. Short season driven by snowmelt. This is backcountry water for those seeking wilderness and wild fish.
- Limestone