The geographic feature that forms the boundary between France and Spain is the Pyrénées mountain range. This majestic range stretches approximately 430 kilometers and serves as a natural barrier between the two countries. The Pyrénées are known for their stunning landscapes, rich biodiversity, and recreational activities such as hiking, skiing, and mountaineering. They are also culturally significant, with historical connections to ancient trade routes and distinct regional identities on either side of the border. The mountains contribute to the unique ecology and climate of the area, supporting a variety of flora and fauna.