The Chaco is the great plain extending in Bolivia, Argentina, Paraguay and in a small portion of Brazil, from the foot of the Andes to the river system of rivers Paraguay and Parana, between Izozog Bathed in the north and the Salinas Grandes in
south. It is in the central plains of the continent are the most extended regions and less populated of South America.
The Chaco is a landscape of extremes, in transformation. Temperatures in the summer out far exceed 40 ° C, while in the south and southwest can be in the winter below 0 ° C. Often large areas are affected by major floods or droughts. Its predominant vegetation, XERO-forest edge, had to give way, in large areas to agriculture and livestock.