Book excerpt: The full incorporation of the extensive sub-humid Chaco region to the farming cattle activity demands, as a previous condition, the systematic and integrated inventory of its natural resources, through which land capability and priority areas of development are defined. LANDSAT images, shown up in recent years, could further the fulfilment of such objectives since this information is inexpensive, of acceptable planimetric accuracy, and periodically available. The present paper deals with the possibilities and limitation of using such information in mapping on small scales the physiography and soils in a region representative of the environmental conditions of the 'sub-humid Chaco'. First, the morphogenetic characteristics and the relief-soil relations of the units in the studied area are described, and methodological cryteria and technical recommendations for mapping on small scales are included. Finally, interpretability of images as to distribution, characterization, dynamics and soil aptitude is evaluated.