Santa Cruz, the largest town inside the lowlands, is found here, as are almost all of Bolivia's petroleum and normal gasoline reserves. The southeastern Section of the lowlands is a component in the Gran Chaco. Nearly rainless for nine months from here the year, this area becomes flooded with the a few months of significant rains. The acute variation in rainfall supports only thorny scrub vegetation and cattle grazing, Despite the fact that latest discoveries of organic gas and petroleum close to the foothills with the Andes have captivated some settlers for the region.