The mountain range that forms a natural border between two countries is the Himalayas. This majestic range extends across several countries, including India and Nepal, and is home to some of the world’s tallest peaks, including Mount Everest. The Himalayas not only serve as a geographical barrier but also have cultural and spiritual significance for various communities. Numerous valleys and passes within the range facilitate trade and pilgrimage, underscoring the mountains' importance in connectivity.