The territory of the commune of Chalais covers an area of 2,435 ha. It stretches from the left edge of the Rhone plain (520 m.) to the extreme limit of the Alpine grassland (La Brinta 2'659 m.) It occupies the entire area, in an east-west direction, between the Rèche and Navizence rivers.
Today, the villages of Chalais, Réchy, the resort of Vercorin and the hamlet of Briey form a single, beautiful commune with a population of almost 3200 inhabitants, even though Vercorin, at the height of the tourist season, can accommodate more than 4500 guests.