Aizkorri-Aratz Natural Park

The Aizkorri-Aratz Natural Park is the second-largest natural park in the Basque Country, extending over 16,000 hectares, in the Aizkorri-Aratz Mountain Range. Included in the park are the highest summits (Aitxuri, 1,551 m) in the Cantabrian-Mediterranean watershed, which together form a massif that is a centre for Basque mountaineering. Declared a natural park in 2006, the area contains limestone ridge-and-valley and siliceous intrusion biomes.

This natural park is situated in the Basque Country, Spain. It was declared a natural park in 2006. It is located in the provinces of Gipuzkoa (80 per cent) and Alava (20 per cent). Four towns in the province of Alava are within the park – Asparrena, Zalduondo, San Millán/Donemiliaga, and Barrundia – and seven of Gipuzkoa: Leintz-Gatzaga, Eskoriatza, Aretxabaleta, Oñati, Legazpi, Zerain, and Zegama. The park includes all the lands of the "Gipuzkoa eta Arabako Partzuergo Orokorra / Parzonería General de Gipuzkoa y Álava".

The park has a humid climate, with no drought in the summer, because of the altitude. The northern slope is wetter than the southern. The climate varies from area to area due to differences in the terrain. The temperature is mild, but the winters are cold.

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