The Sierra de Hornachuelos extends for 60,032ha and is part of the vast 400,000ha Unesco Biosphere Reserve for the Sierra Morena mountain range, along with the natural parks of the adjacent Sierra Norte and the Sierra de Aracena y Picos de Aroche.
Part of the Sierra Morena, the Sierra de Cardeña y Montoro covers 38,449ha of gently rolling hills in the far northeastern corner of Cordoba province. Its slopes, rising from 400m to the highest peak, the 828m-high La Colmena, are dominated by Mediterranean woods and scrubland, interspersed with fields of cereal cultivation.
The central section of the immense Sierra Morena is made up of the extensive and sparsely populated Sierra Norte de Sevilla Natural Park, a landscape of gently rolling hills clad in dense evergreen oaks. It's similar to the adjacent natural parks of the Sierra de Aracena y Picos de Aroche and Hornachuelos, in the provinces of Huelva and Cordoba respectively.
Upon entering the village of Villanueva del Rey, visitors are welcomed by the Ermita de Santiago el Menor, a beautiful chapel providing just a small insight into the rich local history. It has around 1080 inhabitants.
Valsequillo is a small village whose Plaza de la Constitución is a testament to the rich local history, with post-Civil War monuments, the Town Hall and the Iglesia de la Inmaculada Concepción. The village has around 360 inhabitants.
Peñarroya-Pueblonuevo was once an industrial and mining town, and the chimneys of the old industrial zone are still one of the town's most striking features. Today, its highlights include the Museo Geológico-Minero, which houses a collection of minerals, rocks and fossils. The town has about 11, 000 inhabitants.
Obejo's annual religious festivals alone make the village worth a visit, with the Romeria de San Benito pilgrimage, and Los Danzantes de Obejo, a display of dancing which accompanies the village's patron saint on a procession to the chapel. The small Cordoban community has around 2000 inhabitants.