The walk to Refuge Alfred Wills, also known as Refuge d'Anterne, starts at Le Lignon and the first part of the route is the same for both the Alfred Wills and Sales walks. Also in common with the route to Refuge de Sales, the entire walk is within the Sixt-Passy National Nature Reserve, which covers some 9,000 ha ranging in elevation from 900 m up to more than 3,000m. The diversity of the environment within the reserve means it supports a wide variety of fauna and flora and t