In this paper we present an application of the Portulano cartographic method (Bozzano, 2009) to the prefeasibility study and territorial hypothesis of the partition of a district in the province of Buenos Aires. This method constitutes one of the axes of research and action of the TAG-UNLP team, initial core belonging to the Latin American Net, www.territoriosposibles.org. The case of study corresponds to a broader research project1 done in the rural pampas field in two towns of the district of Chascomús in the province of Buenos Aires: Chascomús and Lezama. Chascomús is municipal head of the district of the same name while Manuel J. Cobo - Estación Lezama is a town that currently has a municipal office. This district is at 115 km. at the south-south east from the city of Buenos Aires within what is known as Salado Depression or Depressed pampa.