What mountain range lines the border between Spain and France?

The Pyrenees mountain range lines the border between Spain and France. It stretches approximately 430 kilometers from the Bay of Biscay to the Mediterranean Sea, forming a natural barrier between the two countries. The Pyrenees are known for their rugged and beautiful landscapes, with peaks reaching heights of over 3,000 meters. This mountain range has played a significant role in the history, culture, and geology of both Spain and France, and is home to various wildlife and plant species.