The aim of this article is to compare the Basque lexicon of three valleys of the North of Nafarroa: Esteribar, Erroibar and Anue. The point of departure is a questionnaire entitled “El euskera en Navarra. Encuestas lingüísticas 1965-67”. We try to see if there is a dialectal gap between those valleys which are located from the East to the west of the Pyrenées, and whether the division between “North high-Navarrese” and “South high-Navarrese” is true.