Balerdi (1,195 m), also called Mallozarra, is a mountain of the Aralar massif closing the mountain range at its northern end as well as standing last in the imposing ridge-line called the Malloak (a term used by locals to refer to them, translating roughly as 'jagged ridge') looming over the valley Araitz. It lies on the border between Gipuzkoa and Navarre as most of Aralar forms the border between both Spanish provinces. Despite its descending shape from the higher mount Artubi, the summit is popular with locals and hikers for its characteristic outline of limestone walls and the tricky access to the summit at the end of a narrow rocky stretch with cliffs on either side. As a result, there have been many fatal accidents.