Sierra Menera is a 31 km (19 mi) long mountain range in the southwestern end of the Iberian System.

The eastern rivulets are tributaries of the Jiloca River, the western of the Tagus, and the northern have no exit, ending up in the Laguna de Gallocanta basin.

[4] A 200 km long railway line was built by the Compañía Minera de Sierra Menera S. A. in 1903 in order to bring the iron ore to the harbor of Sagunto.

A blast furnace facility also belonging to the company was also located in Sagunto, where a pelletizing plant and a long jetty were built in the 1970s.

Since mid 20th century, large-scale open-pit mining compounded matters, causing severe land degradation in vast mountain areas.