Ojo Guareña, situated in the north of the province of Burgos, is the largest cave karst formation in the Iberian Peninsula, and one of the ten largest in the world.

This formation is of great speleological interest, as prehistoric shelters have been found here, as well as cave-dwelling invertebrates, including several previously unrecorded species. The formation is of great hydrological, morphological, scientific and even educational importance. It can be admired from various viewpoints including Alto Concha, Retuerta, Pico del Cuerno (on the hiking route). This area is also ideal for practising nature sports.

Ojo Guareña provides a concise insight into the evolution that has taken place from the Middle Palaeolithic Era until the present day; indeed, here visitors will find all the pieces they need to fit this complex jigsaw together. In addition to a wealth of flora and fauna it boasts a rich cultural heritage, bringing together countless attractions in a large natural space.


Category: Natural Monument (13,168 ha.)

Municipalities in the province of Burgos:
  • Espinosa de los Monteros,
  • Merindad de Montija,
  • Merindad de Sotoscueva

Visitor Centre

Park House 'Ojo Guareña'

It provides an insight into the key aspects of both the interior and exterior of the karst formation of Ojo Guareña. A series of simple experiments and games reveal the major scientific discoveries made in the caves and the lifestyle of the region’s inhabitants during the 20th century.

Address: Ctra. BU - 526. 09568

Telephone: 947 138 614

Email: cp.ojoguarena@patrimonionatural.org

Website: http://www.patrimonionatural.org/casas.php?id_casa=4

Website: http://www.miespacionatural.es/espaciospanel/3881

Show morePark House 'Ojo Guareña'

Enviromental Areas

Numerous birds of prey, vultures, egyptian vultures, wild boar, fox and wildcat. 53 species of invertebrates cavemen have been detected inside.
Limestone cut on the southern slopes of the Cordillera Cantábrica. The Guareña River enters this massif originating the karstic complex of Ojo Guareña.
Oaks, Quercus pyrenaica (quejigo), forests of beech and pine forests. Algae, fungi and bacteria are located in caves.