Adarra

Adarra (short for "Adarramendi", meaning 'mount of horns' in Basque) 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 (, 545 m) and Onddo (781 m) 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 vegetation== The 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.