The Central area is the most populated region of the country. The coastal plains are wide and allow the establishment of cities and ports along the Pacific. The Andes maintains altitudes above 6000m but descend slowly starts approaching the 4000 meters on average. The intermediate depression reappears becoming a fertile valley that allows agricultural development and human settlement, due to sediment accumulation. To the south, the Cordillera de la Costa reappears in the range of Nahuelbuta while glacial sediments originate a series of lakes in the area of La Frontera.