Pampa Lagunillas Aquifer is a body of underground water in the Atacama Desert and the western edge of the Altiplano Plateau in Chile. The aquifer lies in an endorheic basin at 4,000 to 4,100 meters above sea level. The water is hosted in alluvial sedimentary fill, pyroclastic deposits and fractured ignimbrites. On surface the alluvial plain associated with the aquifer has an area of about 30 km2 and a bofedal wetland.