Hernio (Basque pronunciation: [ˈeɾnjo]; also spelled Ernio) is an iconic summit in the Basque Country very popular with the Gipuzkoans and located right at the heart of the province. The peak is the highest point of a massif extending north-west to south-east, the summit rising by the pass of Zelatun. Neighbouring summits lined up NW to SE at the range are mount Gazume (997 m) standing west across the summit and mount Herniozabal (1,010 m) closing the range east at the rear.