By a slow process since the beginning of the century, the Federal government has appropriated to itself a district for the National Capital. This evolution has generated a problem for the territorial integrity of Québec. The National Capital Commission is a body endowed with much power. It is a Metropolitan government acting as a disguised Federal District. It breaks up regional continuity in Québec. The present problems of the NCC are good examples relatively to the law of spatial obsolescence proposed by Gottmann. Through ingenious spatial nibbling, the NCC now appears as a Federal municipality in the provincial space and sets a good example of territorial dichotomy in Federal States.