Highlights: Hekou Yao Autonomous County, where Nanxi River in Hekou and Vietnam are connected by bridge and mountains and rivers. Landscapes such as Nanxi River limestone tropical primitive valley rainforest landscape, flower-fish giant spring landscape and Silianshan ancient fortress cultural site are unforgettable. In Nanxi River rafting, "Shimen Pass" is more dangerous. There is a huge rock in front of the beach, like a gate. When the rubber boat passes this gate, the bow and stern of the boat are turned up like a seesaw. Completely smashed into a pile by huge waves. It should be noted that there are a lot of people when crossing the Vietnamese border, so please keep your valuables properly.