 Unterjeckenbach lies on the Jeckenbach between the Palatinate Forest and the Hunsrück.It lies in the narrow valley of the Jeckenbach (Rosental) some 320 m above sea level, stretching partly towards the mountain slope on the stream's left bank.The elevation around the village reaches more than 400 m above sea level in places; the Gerhardsberg peaks at 454.5 m above sea level.