State Road G318, the longest highway in China, stretches 5,476 kilometers from Shanghai to Tibet, passing through several provinces. It was completed in 1996 and offers travelers access to both well-known landscapes like the Yangtze River and lesser-known natural wonders such as Mount Gongga. G318 serves as a vital connection between China's provinces and showcases a diverse range of scenic beauty along the 30-degree north latitude line.