The article aims to highlight the relevance of the territory in the experiences of local development. This article has is analysis the role of territorial determinants of the competitiveness development processes in the sector of textile-clothing inside Casablanca's area (Morocco). Matters relating to territorial dynamics are developed in the social sciences meaning, in particular through research on industrial districts and SPL concepts. Of course, this relative revival of the territory implies questions. How the territorial variable is integrated inside in competitive strategies the economic actors? Which are the space proximity effects on the economic processes in geographically concentrated productive systems? The thought, suggested here, deals with the effects of the geographical proximity on the constitution of a SPL while clarifying as much as possible the institutional and informal articulations of this system and its competitive profile. It turned out that the Casablanca region is overflowing of specific resources, whether of economic process as competition, complementarity or non-economic processes, such as, cooperation, technological externalities, shared values and local regulations. Those resources that are specific to Casablanca region are essential to stimulate the local dynamics of the productive system in question.