The authors are interested by the notion of « pays » as used by Blanchard in his study on the Québec part of the Ottawa region. First, they remind us the particular context in which this notion was used by Blanchard to apprehend a certain form of spatial differentiation within the limitsof the region. Second, from the description that was made by Blanchard for 1941, they give us a brief analysis of the evolution of the ethno-linguistic space. In this analysis, they examine the pertinence of the use of such a notion to take into account the present situation in the region.