 It is made up of the two areas (not frazioni) of Grumo and Nevano, united by the urban planning for two centuries and under the administrative one since the XX century.Grumese territory stands between 44 and 66 m above sea level.The name of Grumo comes from the latin "grumum", meaning "cluster" or "heap" (of houses), whereas the name of Nevano comes from "praedium naevianum", which was a property of "gens Naevia".