IntroductionThis paper examines the geography of social movements through a study of France's immigrant rights movement. Though this movement dates from the 1970s to the present, the paper focuses on the cycle of mobilization between the late 1980s and the mid-1990s. The development of the movement was associated with several spatial forms and processes: First, early in the mobilization cycle, aggrieved immigrants mobilized against restrictive urban policies and by doing this, transformed the locality into the most strategic arena for making rights claims. Second, through these urban struggles, Paris-based immigrants and French activists developed powerful activist networks and employed these networks to call national attention to the plight of immigrants in French cities. Third, powerful activist networks built up during thè urban' phase of the struggle were then deployed to a new campaign against national immigration laws following 1993. Fourth, Parisian activists employed the infrastructure of their national associations to build a network connecting the different localities across the country. The concentration of powerful resources among Parisian activists allowed them to play an enhanced role in the network, but the resulting spatial unevenness of this network produced conflicts along center^periphery lines.Drawing on the geography of social movement literature (Leitner et al, 2008;Miller, 2000;Nicholls, 2009;Routledge, 2003), I maintain that this movement (like all movements) did not unfold on the head of a pin (Miller, 2000) and displayed a spatial structure and dynamics that changed as it progressed in time. This movement is therefore conceived as a concrete spatial entity in motion (`a social movement space'): it is centered in strategic cities, connected and sustained through extensive networks, and achieves coherence within a distinctive geopolitical field. However, to stay in motion, it has had to build upon the relational advantages of the center at the expense of multiple peripheries, introducing internal unevenness and conflicts which threaten its abilities to sustain itself over time.