The present thesis, "Monitoreo ofthe Deforestation in the provinces ofHuallaga, the Gilded one and You lick in the Department ofSan Martín", is oriented to contribute with the planning of the occupation of the territory and the use of the natural resources, in special with the process of Ecological and Economic Zonificación of the Region San Martín who the Institute of Investigations of the Peruvian Amazonía and the Regional Government of San Martín come promoting in our region. This work was made in arder to identify and to quantify the advance of the deforestation in the natural forests in the provinces of Huallaga, the Gilded one and You lick, in the department of San Martín; by means of the use of space indicators of the changes in the forest cover, using the Systems of Remate Perception (Teledetección) and the GIS (SIGs), as well as to identify and/or to describe the socioeco...