 It is the smallest peak of the Urkiola range, and forms part of the same limestone mass that forms the Anboto and the Alluitz.Although it is the smallest one, it has the same rough and wild look, specially when viewed from the "Atxarte" pass that separatest the mountain from the neighbouring Untxillaitz.It has a double summit, highest is Aitz Txiki and the lower one (790m) is "Artxua" or "Sorginkobetagana".