Martín García is an island in the delta of the province of Buenos Aires, Argentina, located on the mouth of the Uruguay River. Geomorphological and archaeological information was used as a basis for the analysis. The geomorphologic study arises from the comparison of aerial photographs and satellite images that allow us to understand the variations of the three current sandy areas and the North coast over time. It was observed that due to the advancing sediment of the island, it is likely that the three sandy areas are remnants of a large one. This area has been a place of human settlement (Guaraní groups) for at least 500 years ago. 1 This paper aims to develop an integrated vision on how Guaranian groups used physical space in this area. For the archaeological analysis, comparative work was carried out on ceramics excavated from the three sites. The ceramics were analyzed both macro and microscopically, and are of the same type in the different excavated sandy areas.Fil: Bognanni, Fabián Alejandro. Universidad Nacional de Luján. Departamento de Ciencias Sociales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Capparelli, Maria Isabel. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Arqueología; ArgentinaFil: Pérez, Maricel. Secretaría de Cultura de la Nación. Dirección Nacional de Cultura y Museos. Instituto Nacional de Antropología y Pensamiento Latinoamericano; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina