The Baillettaz National Nature Reserve was created in 2000, following the complete decommissioning of the Col de l´Iseran Nature Reserve (created in 1963), in order to reclassify the valley´s ski area. It covers an area of approximately 495 ha. Its natural heritage consists mainly of flora, large fauna (chamois and ibex), as well as birds of prey (golden eagle, bearded vulture and common kestrel).