Water resources management in Chile formalized agreements with both Bolivia and Argentina to manage shared resources and water storage projects. Chile is also supported in rural water supply with $150 million in loans by the World Bank and the Inter-American Development Bank. Chile has three distinct hydrological regions: There are a number of important rivers in Chile. The longest river in Chile, the Loa River, is located in the Atacama Desert. The largest river by volume, the Rio Baker is found in the Aysén Region, of Patagonia, and the Biobío, a source of hydropower, and the Maipo supplies Santiago with water. Water quality is quite
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