Final answer:
The longest mountain range in the world is the Andes Mountains, extending 7,000 kilometers (4,300 miles) along the western coast of South America.
Step-by-step explanation:
The longest mountain range in the world is the Andes Mountains. It spans over 7,000 kilometers (4,300 miles) in length, stretching along the western coast of South America through seven countries: Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, and Venezuela. The Andes Mountains are known for their breathtaking peaks, including Mount Aconcagua, the highest peak in the western hemisphere.
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