Introduction to Tianchi: Tianchi is 313 meters above sea level and 68 meters above the ground. It is a pool of clear water embedded in eight peaks. The entire location belongs to the Quaternary karst formation, but the water in the pool never dries up during drought or overflows during the rainy season. The water quality is sweet and drinkable, and the color of the water changes according to time. In the early morning, the water in the pool is dark green and bottomless. At noon, the sun shines in the pool, making it crimson. In the evening, when the sun shines in the west, the water in the pool reflects the red clouds like a mirror. In the middle of the night, the moonlight shines brightly, making the pool surface a silvery white.