Geography of Chile regions: the far north, the near north, central Chile, the south, and the far south. Each has its own characteristic vegetation, fauna, climate, and, despite the omnipresence of both the Andes and the Pacific, its own distinct topography. The far north (Norte Grande), which extends from the Peruvian border to about 27° south latitude, a line roughly paralleled to the Copiapó River, is extremely arid. It mainly contains the Atacama Desert, one of the driest areas in the world. In certain areas, this desert does not register any rainfall at all. Geographically, the aridity can be explained by the following
Flora of the Sonoran Desert absent on the California side of the Colorado River. Desert Holly ("Atriplex hymenelytra") can tolerate even the hottest and driest sites. The area where two vegetation types border, overlap, and transition is called an ecotone. The ecotone between the hotter, drier Colorado Desert and that of the relatively cooler and wetter Arizona Upland occurs from Parker, Arizona southeast to near Phoenix, then south to Organ Pipe Cactus National Monument. Density of vegetation gradually diminishes moving from the Arizona Upland into the Colorado Desert proper. can be found with stems climbing through shrubs and other vegetation, producing "spectacular" floral displays on