Adarra

Adarra is a mountain south of the city of San Sebastian in the Basque Country. It is a popular peak with the local residents. The mountain is flanked on the north by the minor summits of Oindi or Onddi and Onddo to the south, all of them located at the top of a long mountain range of modest height between the Urumea and Leitzaran valleys, which extends south right to the edge of the Navarrese town of Leitza.Geology and vegetationThe mountain stands on the westernmost end of the Pyrenees. Outcrops of slate, sandstone, conglomerates, red silt and other materials can be found on the peak, largely from the Paleozoic Era and Mesozoic Era.On its eastern slopes, patches of indigenous forest and vegetation abound, while on the western side (especially on the way down to Leitzaran) pine tree used for logging prevails. Grassland strips used for grazing sheep and horses interspersed with forest are common.Prehistoric monumentsThe mountain and the whole area show several examples of megalithic art, for the most part small monuments which are common on the Atlantic basin of the Basque Country, dating from the Neolithic and Bronze Age. 34 stone circles, four dolmens, three cists and two menhirs can be found locally, dating from the megalithic era.