Located in central western Navarre, the Lokiz mountains run from the Alava corridor to San Vicente de Arana and Santa Cruz de Campezo and from there to the valleys of Allín and Metauten, covering a distance of 22 km and occupying an area of 140 square kilometres. They provide the southern flank to the Valley of Améscoa
It is a karstic massif with an elongated shape less marked than the Urbasa
massif, with four main aquifers. Sharp crags, dizzying slopes, hidden caves and monumental walls shape this sierra that runs parallel to Urbasa.
The sierra's local flora shows an exceptional diversity thanks to its location on a natural bioclimatic border
. From the highest elevations to the lowest areas, there is a staggered sequence of beech trees, oak trees, holm oaks, strawberry trees, kermes oaks and sandaracs, among other species. The fauna is also equally diverse and one can easily observe roebuck and wild boar through the trees, while the skies abound in eagle owls, griffon vultures and kestrels.
The Sierra de Lóquiz is a mysterious mountainous fold traversed by numerous trails of various degrees of difficulty. Among these are:
Ascent to the basilica of Santiago de Lóquiz: A 7,4 kilometre trail, with an altitude difference of 390 metres that starts off from the church of Ollobarren. Estimated duration: 2 hours. The itinerary is shaped like a tennis racquet. The trail goes through a poplar grove and continues though a kermes oak copse and then zigzags up a steep stony slope. During the climb, one can admire the lovely landscape of the Allín valley. At the top, the trail crosses the "Hole of Ollobarren", a thirty-metre natural tunnel. Beyond that, the path leads to an esplanade where the shrine of Santiago de Lóquiz is located. From there, the trail descends through the Ganuza Pass, passing through the eponymous town and continuing back to Ollobarren.
Ascent to the shrine of San Cosme and San Damián: A 12,2 kilometre trail, with an altitude difference of 555 metres, that starts off from Galdeano. Estimated duration: 2 hours and 50 minutes. The itinerary is circular. You can park on the streets of Galdeano and take the trail very close to the church of San Pedro, built in medieval style. You pass the shrine of San Miguel on your right and begin the ascent among scattered gall oaks and grazing cattle. You continue on to the forest located at the northwest where between the beech trees you can see the top of the mountains and the shrine of San Cosme and San Damián. Then on to Artavia, from there to the shrine of San Andrés, and you are on your way back to Galdeano.