On the fifth day of the first year, the second stop of self-driving tour is Detian Transnational Falls. The largest waterfall in Asia and the fourth in the world. It is like landscape painting, riding on a bamboo raft, standing in the painting, close to the waterfall zero distance, feeling her momentum, although the water volume is not the largest, but can be closer. Here, China and Vietnam are separated by the Guichun River. The Banyue Waterfall in Vietnam has only three water pillars, which is less magnificent than the Detian Waterfall in China. Vietnamese tourists paddling bamboo rafts on rivers near Chinese bamboo rafts sell Vietnamese specialties. It can even dock on the coast of China. The 835 boundary marker was erected in 2001, redefining the Sino-Vietnamese border. Nearby, there is the national cultural relic No. 53 boundary marker. It was erected in the 14th year of Guangxu in the Great Qing Dynasty, but it has lost its defining significance. In Detian Transnational Falls scenic spot, besides the first waterfall in Asia and the fourth waterfall in the world, there is also an interesting feature of transnational markets. At the peak of Detian Waterfall, the border trade fairs on the 835 sides of the Sino Vietnamese border, which are formed spontaneously by the Sino Vietnamese border residents, sell Vietnamese snacks, cigarettes, perfume, red bull, and famous Vietnamese rubber slippers.