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Urban morphogenesis in informal settlements results from occupation, transformation, and morphological extension processes that cause territorial fragmentation, producing inequality and spatial segregation, which are the main characteristics of Latin American informal urbanism. However, there is scarce research on analysing the processes that cause fragmentation. The research develops a morphological analysis that aims to improve the processes of urban assemblage by identifying the dynamics of territorialisation and deterritorialisation promoted by political and social factors, capable of producing spatial discontinuity in the informal morphogenic evolution. As a method, a diachronic analysis is developed by mapping the morphological evolution of the processes of occupation, transformation and extension of networks between 2002 and 2021 on three models of informal settlements in Lima, Mexico City, Medellin and Santiago de Chile for a comparison of cases. As a result, corrective mechanisms called “interface devices” (ID) are obtained, which include the improvement of land management policies and the implementation of gradual interventions according to informal evolution, decreasing urban fragmentation in different phases of territorial evolution and the possibility of being applied in international contexts of the global south.

An “Innerburb” is an urban structure that emerged between the 1950s and 1980s, settled in rural areas, and is considered the first periphery of the Latin American city. This structure results from socio-spatial and territorial evolutionary processes, constituting the pinnacle of informal evolution. However, despite offering a comprehensive perspective on the informal problem, innerburbs have been scarcely reviewed in the literature. This article explores the Latin American innerburb by adopting as a method a comparative study of the public/private interface in the cases of San Cosme in Lima, Villa Rodolfo Ricciardelli in Buenos Aires and Vila Heliopolis in São Paulo, evaluating their adaptation and interconnection with the city through morphological indicators, using morphological mapping through satellite images as an analytical tool, and using Space Syntax as a topological approach in the analysis of connectivity and visibility indicators. The objective of the research is the detection of morphological patterns that alter the functioning of the public/private interface in innerburbs. The results show that the existence of impermeable facades, the lack of public spaces and the illegal appropriation in the development of informal practices are transgressive adaptability patterns at the micro-scale that affect the interface, drastically limiting the interconnection between the innerburb and the formal fabric, restricting its morphological openness and affecting the development of socioeconomic activities. As a discussion and conclusion, corrective measures for progressive improvement in innerburbs are established, focusing on the adaptability of housing and road space as a means of interconnection between the innerburb and the city.