Grotte di Alt Àneu

Alt Àneu is a municipality in Pallars Sobirà that brings together 58 inventoried cavities: 42 pits and 16 caves. Together they total 5229 m of development and reach a maximum depth of 320 m. All the registered cavities develop in limestone.

Among the cavities most notable for their length are Avenc Gran d'Aulà, with 1530 m, Cigalera de l'Obaga de Baleran, with 900 m, and Cova Nº1 del Barranc de Moredo, with 764 m. As for depth, Cigalera de l'Obaga de Baleran reaches 320 m, followed by Avenc Gran d'Aulà with 155 m and Avenc de la Tindarella with 116 m.

Avenc Gran d'Aulà, located at the port d'Aulà (2262 m), was discovered in July 1975 by the SS Plantaurel and the ASMP, and in 1984 its maximum depth was fixed at the -155 level. Cova Nº1 del Barranc de Moredo was discovered and explored in August 1979 by the S.S. Plantaurel and completed in September 1991 by the SIS del CE Terrassa.