Lakes, Pinus forests, acid bogs, meadows, abandoned fields and industrial areas all occur in the site. The main human activity was mining, abandoned in 1995.
The site is important for breeding raptors and wintering Grus grus. Species of global conservation concern that do not meet IBA criteria: Aythya nyroca (passage).
BirdLife International (2019) Important Bird Areas factsheet: Arjuzanx. Downloaded from http://www.birdlife.org on 06/12/2019.