Sierras de Cazorla, Segura y Las Villas Natural Park (Spanish: Parque Natural de las Sierras de Cazorla, Segura y Las Villas) is a natural park in the eastern and northeastern part of the province of Jaén, Spain, established in 1986. With an area of 2,099.2 square kilometres (810.5 sq mi), it is the largest protected area in Spain and the second largest in Europe. It was declared a biosphere reserve by UNESCO in 1983 and also a Special Protection Area for migratory birds in 1988.

Protection of roughly 700 square kilometres (270 sq mi) in the southern part of the park dates back to 1960, when the National Hunting Reserve of las Sierras de Cazorla y Segura (Coto Nacional de Caza de las Sierras de Cazorla y Segura) was established. Given its large area, embracing 23 municipalities[2] with more than 80,000 inhabitants,[citation needed] the level of protection varies from one part of the park to another, allowing a diversity of economic activity in the majority of the territory.

The beauty of the countryside and the rich flora and fauna combine with a rich cultural heritage to make the region an important destination for tourism.

The park includes two high ranges, the Sierra de Cazorla and the Sierra de Segura. These mountain ranges are part of the Prebaetic System, the northernmost portion of the Baetic Cordillera. Generally running southeast-to-northeast, they meet up with the Sierra Morena that runs from this region west to Portugal. Between the mountain ranges are important valleys, including the headwaters of the Guadalquivir, which-after initially heading some 50 kilometres (30 mi) northeast through the mountains-runs west to the Atlantic Ocean, but also of the Segura, which runs east to the Mediterranean.

Altitudes in the park range from 500 metres (1,600 ft) above sea level where the river Guadiana Menor flows out the southern boundary of the park to the 2,107-metre (6,913 ft) peak of Cerro las Empanadas. Other important peaks are Alto de la Cabrilla (2,078 metres (6,818 ft)), Cabañas (2,027 metres (6,650 ft)), Las Banderillas (1,993 metres (6,539 ft)), Aguilón del Loco (1,956 metres (6,417 ft)), Blanquillo or Pedro Miguel (1,830 metres (6,000 ft)), and El Yelmo (1,808 metres (5,932 ft)).