Introduction to Zhangbu Cave: Zhangbu Cave is located on the mountainside on the right bank of Tengzhu Gorge. The cave has three floors. The upper floor is called Xiangyun Cave because the magma in the cave drips on the bottom of the cave and is washed away by water all year round to form beautiful clouds. The air inside is fresh and cool, and you can hear the roar of the underground river. The second floor is called the Nitrate Cave because local people used to boil saltpeter here in the old days. There are many stalagmites in the cave with different shapes; the third floor is Yin Yang Cave, also known as the Hot and Cold Water Cave, has an underground river outlet that is only 0.5-1 meter above the water surface of the canyon. There are two underground rivers in the cave, flowing out from two forked holes. The right forked hole flows out of cold water, and the left forked hole flows out. The water flowing out of the fork hole is hot water, and the temperature difference between the two is about 10 degrees.