Introduction to Bingshu Baojian Gorge: Bingshu Baojian Gorge is located in the western section of Xiling Gorge of the Three Gorges of the Yangtze River, in Zigui County, Hubei Province. It starts from the mouth of Xiangxi River in the west and ends at Xintan in the east. It is about 5 kilometers long, and the narrowest point of the river is nearly 100 meters. The rock walls along the coast are mainly composed of limestone. Because there is a box-shaped relic from an ancient rock coffin buried in the stone crevices on the north bank of the gorge, which is shaped like a scroll. It is said that it is the military book hidden by Zhuge Liang. Bingshu Baojianxia. And because the color of the "book" is like iron, it is also called Iron Coffin Gorge. Legend has it that Zhuge Liang once stationed troops and stored grain here, also known as Micang Gorge.