The longest mountain range in the world is the Andes, which spans about 4,300 miles (7,000 kilometers) along the western edge of South America. This extensive range runs through multiple countries, including Argentina, Chile, and Peru. The Andes are known for their stunning landscapes, high peaks, including Aconcagua, and rich biodiversity. They play a vital role in the climate and ecosystems of the surrounding areas and have significant cultural importance for indigenous peoples.