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In recent years there has been a growing interest in detecting, delimit and inventory wetlands under an ecohydrogeomorphic approach to expand the knowledge of these ecosystems and enable the development of management guidelines for their use. The aim of this article is detect and delimit those sectors that reflect favorable ecohydrogeomorphic conditions to define them as wetlands in a sector of the Alsina basin located in the southwest of the province of Buenos Aires, Argentina. A complementary methodology was applied between optiand radar images, consisting of the use of a digital AlosPalsar elevation model and Sentinel 2 A and Sentinel 1 images. A flood pulse was addressed in the shallow lake that occurred in 2017. The wet events reflect the operation of the shallow lake and the wetland systems. Biophysical changes that occurred in the perilaguna sectors were analyzed in reference to the entry of precipitations. The results verified the presence of different types of wetlands between the shallow lake and its perilagunar area that during a flood function as a hybrid ecosystem. [ABSTRACT FROM AUTHOR]