Here are some hiking trails in the French Pyrenees that may fit your criteria:

Néouvielle Nature Reserve: The Néouvielle Nature Reserve is located in the French Pyrenees and offers several circular winter hiking trails, including the Boucle du lac de l'Oule, which is approximately 18km and can be completed in two days. This trail takes you through stunning scenery, including frozen lakes and snow-covered peaks. Camping is allowed in designated areas within the nature reserve, but it's important to check for any restrictions or permits required before heading out.

Plateau de Beille: The Plateau de Beille is a high plateau in the French Pyrenees and offers several circular winter hiking trails. One option is the Boucle de l'Estagnol, which is approximately 22km and can be completed in two days. This trail takes you through pine forests and offers panoramic views of the surrounding mountains. Camping is allowed in designated areas along the trail.

Gavarnie-Gèdre: The Gavarnie-Gèdre area is located in the French Pyrenees and offers several circular winter hiking trails, including the Boucle des lacs, which is approximately 20km and can be completed in two days. This trail takes you through snow-covered forests and past frozen waterfalls, and offers stunning views of the surrounding mountains. Camping is allowed in designated areas along the trail.
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