Shuzhenggou is the ditch at the entrance of Jiuzhaigou three ditches, from the entrance of the scenic spot to the Nuorilang Center, the scenery is good, the road slope is small, the main attractions are the reed sea, tiger sea, rhino sea, tree Zhengqun sea, tree waterfall, etc. It is best to swim this ditch at the end, because it is too late to the scenic car to the other two ditches. If you swim this ditch first, you may not catch up with the other two ditches.