Learn about the Andes, the longest continental mountain range in the world, spanning seven countries in South America. Discover its formation, regions, peaks, plateaus, valleys, climate, biodiversity and indigenous peoples. The Andes is the longest mountain range in the world. TheAndes Mountains extend over seven countries: Argentina (Mount Aconcagua), Bolivia (Huayna Potosi), Chile, Colombia, Ecuador, Peru, and Venezuela, known as Andean States. The Andes extend from South to North through seven South American countries: Argentina, Chile, Bolivia, Peru, Ecuador, Colombia, and Venezuela. Along their length, the Andes are split into several ranges, separated by intermediate depressions. Also referred to as “Cordillera de los Andes” in Spanish, the Andes Mountains is the world’s longest mountain range that stretches for more than 6,999km along the western margin of the South American continent.