Santa Cruz, the biggest town inside the lowlands, is situated right here, as are a lot of Bolivia's petroleum and organic fuel reserves. The southeastern Portion of the lowlands is an element from the Gran Chaco. Just about rainless for nine months on the calendar year, this location will become flooded here for your 3 months of major rains. The extreme variation in rainfall supports only thorny scrub vegetation and cattle grazing, While recent discoveries of organic fuel and petroleum close to the foothills from the Andes have captivated some settlers into the region.