 Northwest of town is "Castels" hill and west of the Nidberg is Castels fortress.It consists of the village of Mels, the settlements of Heiligkreuz bei Mels, Plons, Ragnatsch, the hamlets of Butz, St. Martin, Mädris and Tils, the alpine settlement of Vermol as well as the Walser villages of Schwendi and Weisstannen.Chapfensee is a reservoir located in the municipality.