Core Points - G331 (Dan-A Line) is the second longest national highway in China, stretching 9333 kilometers and crossing six provinces in Northeast, North China, and Northwest regions [2][5][8] - The highway is known as the "most beautiful border road" and connects numerous villages and attractions, showcasing the vitality and changes it brings to border areas [2][5][8] Summary by Sections - **Highway Overview** - G331 spans 9333 kilometers, making it the second longest national highway in China [2][5][8] - It crosses six provinces, including Northeast, North China, and Northwest regions [2][5][8] - **Tourism and Economic Impact** - The highway connects various villages and scenic spots, enhancing local tourism [2][5][8] - New tourism signboards and thriving specialty industries are visible along the route, reflecting the economic vitality brought to border regions [2][5][8]