Sierra de Montánchez is a mountain range in the greater Montes de Toledo range, Spain. It is named after nearby Montánchez town, the capital of the Tierra de Montánchez comarca, located on its slopes. This range gives its name to the Mancomunidad Integral Sierra de Montánchez. This mountain range separates the drainage basin of the Tagus to the north from the basin of the Guadiana to the south. The main rivers that have their sources in this range are the Salor and Tamuja, a tributary of the Almonte, flowing towards the Tagus, as well as the Aljucén River, a tributary of the Guadiana.