sentences:  The main mountain is a round grass-covered summit where a 20-metre-tall metallic cross has been constructed to reach the altitude of 1,500 m. Other important mountains of the massif are the Berretín (1,227 m), Lekanda (1,301 m) and Aldamin (1,376 m) limestone peaks.Part of the massif is delimited North by the high karstic plateau of "Itxina", an intrincate landscape of limestone full of shafts and caves such as "Supelegor".The "Atxular's Eye" cave is the only walking access to the plateau.