SUMMARY
The closed urbanism in the medium-sized cities and metropolitan areas in Mexico, despite being exclusive residential enclaves that suppose qualities on better levels of life and security in the Metropolitan Zone of the south of Tamaulipas, present locations of risk and high levels of fragmentation along with the expanded growth of the region, generating important changes in the urban and affecting the social and cultural. Due to this, by means of the urban spatial analysis of the formal, structural and functional variables, we intend to characterize the physical-spatial phenomenon according to the particularities that distinguish them from the rest of the local open urbanizations.