The mountain range that runs along the western coast of South America is the Andes. Stretching over 4,300 miles, the Andes is the longest continental mountain range in the world, passing through several countries including Argentina, Chile, and Peru. This range features diverse climates and ecosystems, from tropical regions to arctic conditions at higher elevations. The Andes are also home to rich biodiversity and indigenous cultures that contribute to its unique geographic and cultural landscape.