The Bembézar reservoir is a reservoir located in the province of Córdoba in the municipalities of Espiel and Hornachuelos. It began its activities in 1952 and has a capacity of 342.1 hm³ used for the supply of drinking water, electricity generation and irrigation to nearby towns.
It is a sinuous and embedded reservoir that occupies the central part of the Sierra de Hornachuelos natural park. It collects the waters of the Bembézar River itself and most of its main tributaries, such as the Névalo and Benajarafe and the Baja, Guazalema, Pajarón and Calderas streams, which annually contribute an average of 204 hm³ of water.
The network formed by these rivers and streams has shaped a landscape around this reservoir in which deep valleys predominate, with steep slopes with a scarcity of usable soil for human activity, which has preserved the vegetation: strawberry trees, holm oaks, cork oaks. and mainly gall-oaks and the fauna associated with it, black vultures and griffon vultures, eagles, lynx, genets, wild boars and deer.