This paper describes the distribution of the stress in monomorphemic words elicited in four Mapuche-Pehuenche-speaking areas of the Andes mountain range. For this purpose, the stressed syllables of monomorphemic words were analyzed, which were elicited from forty-four bilingual (Mapudungun-Spanish) adult speakers. It was concluded that: a) the stress in the mountain range is mostly oxytonic; b) it is possible to relate the north-south axis to the decrease in oxytonic stress; and c) the tendency for heavy syllables to attract the stress, as reported in the literature, is confirmed by our study. Further investigations on word stress in other regions where Mapudungun is spoken are an important projection of this study, so as to compare the findings presented herein.