Which mountain range forms the natural border between France and Spain?

The Pyrenees mountain range serves as the natural border between France and Spain, stretching approximately 491 kilometers (305 miles) from the Atlantic Ocean to the Mediterranean Sea. This range is not only significant geographically but also culturally, as it has historically separated the two nations and influenced their development and interactions.

The Pyrenees are known for their dramatic peaks, deep valleys, and diverse ecosystems, making them a significant feature in the landscape of both countries. The mountains also host a variety of wildlife, contribute to regional climates, and offer numerous outdoor recreational activities, such as hiking and skiing, reflecting their importance beyond just a border.

In contrast, the Alps are located further east and span several countries including Switzerland, Italy, and Austria, and thus do not act as a border between France and Spain. The Rocky Mountains are primarily found in North America, and the Andes run along the western edge of South America, making them geographically unrelated to the countries in question.