Introduction to Tianchi - Ancient Volcanic Ecological Tourist Area: There is a round basin-shaped volcanic crater with a diameter of more than 150 meters on the top of Nanglaqiu Mountain. It was once filled with mysterious spiritual pools accumulated over one million years. The deep pool was once With a height of more than ten meters, it never freezes all year round, and the water is as clear as a mirror. It is the only and most exquisite volcanic "Tianchi bonsai" in the world.