 Merzweiler lies in the Jeckenbach valley in the Western Palatinate between the Palatinate Forest and the Hunsrück at elevations ranging from 250 to 260 m above sea level.The elevations around the village reach heights of more than 300 m above sea level (Brecherberg 362 m, Rüllberg 350 m).The municipal area measures 226 ha, of which roughly 2 ha is settled and 27 ha is wooded.