Sierra de Villuercas or Sierra de las Villuercas, also known as Sierra de Guadalupe after nearby Guadalupe town, is a mountain range in the greater Montes de Toledo range, Spain. It is located in province of Cáceres, autonomous community of Extremadura.Rivers Almonte and Ibor, tributaries of the Tagus, and the Ruecas and Guadalupe River, tributaries of the Guadiana, have their sources in this range.