 Of the unproductive areas, 12.4% is unproductive vegetation and 19.0% is too rocky for vegetation.Nax is situated at the entrance to the Hérens valley near a rocky promontory which may provided its name, from the , "nose".The blazon of the village coat of arms is "Azure, issuant from Coupeaux Vert between two Bucks rampant respectant Argent a Pine Tree Vert trunked proper topped with a Bird volant Or, in chief two Mullets of Five of the last."