Géographie de la fragmentation urbaine et territoires scolaires : effets des contextes locaux sur les pratiques scolaires à Marseille : Marseille, a "dual" city marked by various forms of separatism and communitarianism, has been experiencing an acceleration of territorial recompositions over the past fifteen years, redefining the scales of social contrasts. The city is no longer simply segregated, it is diversifying and is made up of increasingly heterogeneous living spaces that determine the contours of a mosaic. School practices are proving to be excellent functional indicators of the structural invariants of segregation as well as of these new dynamics of urban fragmentation. The study carried out in Marseilles emphasizes that homogeneous social contexts encourage compliance with the school map, whereas new local heterogeneities encourage social withdrawal, both residential and functional, particularly in the school field. The challenge is to understand the processes at work in the (re)production of educational inequalities in this changing context. Fr En