Andes
The Andes or Andean Mountains () are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. This range is about long, about wide (widest between 18° south and 20° south latitude), and of an average height of about . The Andes extend from north to south through seven South American countries: Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile and Argentina.
Chilean Central Valley
The main portion the Central Valley extends from Tiltil (33°05' S) near Santiago to Temuco (38°45' S). The Coast Range and the Andes almost merge in two locations: one between Santiago and Rancagua and another between San Fernando and Rengo. The result is the enclosure of the Central Valley into two smaller basins in the north: Santiago Basin and Rancagua Basin.