The four major phases of the evolution of regional divisions of Québec is defined through the analysis of geography textbooks produced in Québec from 1804 to 1957. The study of the Outaouais region provides an illustration of the sequence and implications of those regional divisions in the literature. The emerging idea of an Outaouais region is thus reconstituted. This idea has certainly had a significant impact because of the public nature of the textbook. The article further examines the existing links between the regional divisions and the regional concept through time. The study of textbooks reveals some aspects of the social function of school geography.