sentences:  Herschweiler-Pettersheim is the most populous municipality in the "Verbandsgemeinde" of Glan-Münchweiler.The municipal area measures 747 ha, of which 203 ha is wooded.Geologically, Herschweiler-Pettersheim lies on layers of lower rotliegend, in particular the Middle Kusel Group (ruk2), which is made up mainly of sandstones and arkoses along with siltstones, claystones and conglomerates.