Introduction to Tianyi Valley: Huaying Mountain Tianyi Valley, formerly known as Huaying Mountain Grand Canyon, is located at the southern foot of the main peak of Huaying Mountain. Tianyi Valley is a geological wonder formed when the water from thousands of peaks and gorges in Huaying Mountain meets the fault layers of karst landforms. There are countless cave wonders and waterfalls in the canyon that is only 1.5 kilometers long. About 60 large and small caves and more than 120 large and small waterfalls have been discovered, of which more than 10 are hundreds of meters high and more than 30 are tens of meters high. at.