Introduction to Longmen Lake: Longmen Gorge is more than 100 meters deep, with two mountains facing each other at the mouth of the valley, shaped like a mountain gate. It is said that it was the entrance and exit of Guniu Subduing the Dragon King, so it is called "Longmen". Longmen is 88 meters high and more than 20 meters wide. The water flowing underneath it gathers to form the crystal clear Longmen Lake.