Introduction to Dingjun Mountain: The main peak, Dingjun Mountain, is the highest point, with an altitude of 833 meters. There was originally a stone tablet of "Ancient Dingjun Mountain" on the top of the mountain. It was destroyed during the Cultural Revolution and is now newly erected. There is a large natural pot-bottom-shaped depression in the south of Shannan with a circumference of 1.5 kilometers. It is known as the "Yangtian Depression" during the Three Kingdoms period, which can be used to station thousands of soldiers. There is a vast fertile wilderness at the northern foot. It is Wuhouping where Zhuge Liang laid out the "Eight Formations" and set up the "Governor's Altar". It is also the battlefield where Huang Zhong fought against Xiahou Yuan. "Horse nails" and arrowheads are often found, and it is said that they were used by the Shu army. There are "Zhanjiang Bridge" and "Octagonal Glazed Well" beside the mountain, which are octagonal in shape and made of thin-leaf and fine-patterned Han bricks. None of them survive. There is a large stone halfway up the mountain, about 3.3 meters high and 2 meters wide. It has a slit in the middle with varying widths. It is called the "shield". It is said that it was a relic used by Zhuge Liang to block enemy arrows.