Although it is the smallest one, it has the same rough and wild look, especially when viewed from the "Atxarte" pass that separates the mountain from the neighbouring Untxillaitz. It has a double summit- the highest is Aitz Txiki and the lowest one is "Artxua" or "Sorginkobetagana". It is rough and difficult from all sides except the one faced to "Atxarte", which is the main access route. There are remains of a castle that was used to watch the Atxarte pass.