Réserve naturelle nationale de la Bailletaz, National nature reserve in Val-d'Isère, France

Réserve naturelle nationale de la Bailletaz covers 495 hectares in the Bailletaz valley of Val-d'Isère, between the upper Isère valley and the Italian border, next to the Grande Sassière reserve. A small oval lake with a pale shallow rim sits in a grassy basin; loose gray scree slopes below it, and steep rocky faces with snow patches rise above.

The reserve was created by a decree of 6 December 2000, as compensation for the decommissioning of a nearby sector near the Col de l'Iseran for ski-lift equipment. It protects the lake and valley of the same name over 495 hectares in the Haute Tarentaise, adjacent to the Grande Sassière reserve.

The reserve takes its name from the small lake in the valley, which gave the site its name. Hiking trails cross the valley, and the reserve is contiguous with the Grande Sassière reserve on the Italian border side. The Vanoise National Park manages it.

Visitors can reach the reserve by hiking on designated trails, but must follow strict rules prohibiting plant collection, hunting, camping, and motorized vehicles. Staying on marked paths and respecting protection regulations helps preserve the alpine environment for everyone.

The reserve's flora includes the Piedmont Primrose, the pennate-leaved violet, Saxifraga bryoides and Saxifraga diapensioides, the inflated-calyx gentianella and the Rhaetian alpine crepis. The site is crossed by hiking trails, and the reserve is managed by Vanoise National Park.