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Examining the interactions between Man and his environment seems to be a difficult research exercise and remains an interdisciplinary topic. In recent years, wet depressions where watercourses from watersheds have witnessed a severe degradation of their ecosystem. This degradation is even greater where man intervenes by his various inappropriate practices. The urban air of the Sebkhat Sejoumi watershed, which is adjacent to the capital, is witnessing a spectacular growth. As a result of the successive waves of formal and informal urbanization, built spaces have increased from 487 ha (2.01% of total area) in 1956 to 9858, 86 ha (or 40.72% of total area) in 2016. The study of the evolution of the landscape over a period of 67 years (1950-2016) would make it possible to evaluate the impact of these changes on the aggravation of the risk of environmental degradation. The short-sighted human intervention can also be seen in the rapid and anarchic urbanization of almost all the borders of the Sebkhat. This incredibly increasing urbanization, especially towards the south and south-east of the depression, where drainage was formerly done (Mghira-Mourouj-Bir el Kasâa) have made it impossible to evacuate the water of depression. Consequently, the equilibrium of the ecosystem of the Sébkhat is broken. Such an evolution has led to the transformation of Sébkhat Séjoumi into a truly closed depression with an endorheic hydrological system. [ABSTRACT FROM AUTHOR]