Rupturing with traditional forms of insertion, Montréal street youths have, in a precarious manner, began to use the urban socio-spatial margin as a site of identity recomposition. This socio-spatial margin is presented as a geographical organization structuring the practices of the appropriation of place. The author offers a theoretical understanding of the link unifying the identity process and space. It is on the basis of the key-concepts transitional space and geographical trajectory that it is possible to identify the geo-social route taken by street youths. As such, in order to assess the potential for the marginalized socialization of street youths, it is important to consider the renewal efforts underway in east-central Montréal.