Introduction to Yushan City Wall Scenic Area: Yushan City Wall is a section of Changshu City Wall along Yushan Mountain. It is the only city wall built on a mountain in southern Jiangsu, so it is known as the "Jiangnan Little Great Wall". It covers an area of ​​27,000 square meters. From the top of the city, you can see green mountains and green waters, ancient city lanes, and mountains, water, and cities integrated into one. It shows the unique scenery of "ten miles of green mountains half entering the city".