Andes. The Andes are the second highest Mountain Range in the world with many peaks rising over 20,000 feet. The Andes Mountains are the longest mountain range in the world. They stretch 4,500 miles (7,200 km) from north to south, along the west coast of the continent.he Andes Mountains are located in South America, running north to south along the western coast of the continent. Click here to find out more. Rockies. The Rocky Mountains are a vast mountain system in Western North America, extending north-south from Canada to New Mexico, a distance of about 3,000 miles (4800 km).