Saharan and second-order urban Faya Largeau is in Chad, an area of convergence of climatic forces and urban unsustainability. In this paper I am going to write about the vulnerability of Faya considering a systemic approach which mixes the physical, the socio-spatial and the institutional levels. The theoretical foundation restrains on the systemic vulnerability model that has been developed by Wisner et al. (2004), De Sherbinin et al. (2007), and Satterthwaite et al. (2007; 2019) as an interaction between many factors of drivers, acting as a combination of environmental exposure, social precarity, and governance deficits. It focuses on field research that was carried out in 2022 and involves observations, semi-structured interviews together with multi-criteria spatial analysis via a GIS. The findings indicate compound defenses because of the combination of climatic risks (extreme heat, the invasion of sand, water scarcity, and high-velocity winds) by urban maladaptation. The typology of the neighborhoods constructed inter-urbanally indicates that there are significant differences in the level of vulnerability of three types of neighborhoods. As an instance of peripheral Saharan cities, Faya is simultaneously marginalized in environment and politics, since it is subjected to environmental risks and poorly attached to national interests. The paper sustains the perspective of diversified planning, in which territorialized vulnerabilities and the dynamics peculiar to the conditions of desert environment, which has not often been taken into account in policies on urban development, is considered.