Which geographical feature primarily separates Europe from Asia?

The Ural Mountains serve as the principal geographical feature that separates Europe from Asia. This mountain range runs approximately 2,500 kilometers (1,550 miles) from north to south through western Russia, creating a natural boundary between the two continents. The Ural Mountains have been recognized historically for defining the transition zone between the European and Asian landmasses, serving as a cultural and geographical divider.

In contrast, the other mountain ranges listed do not serve this function. The Rocky Mountains are located much further west, primarily in North America, while the Appalachian Mountains are also found in the eastern United States. The Andes Mountains are situated in South America and have no geographical relevance to the European-Asian boundary. Therefore, the Ural Mountains are uniquely positioned to fulfill the role of delineating Europe from Asia, making them the correct choice.