Part of Mier y Guerra's work involved the foundation of 12 towns, most of which were located in the right margin of the Magdalena. These towns were established in an initial stage that lasted four years see Figure 1 .
La labor que Mier y Guerra llevó a cabo significó la fundación de 12 pueblos ubicados casi todos en la margen derecha del Magdalena en una primera etapa que le tomó cuatro años ver figura 1.