It turns out that there is an unremarkable hill ten miles east of the county seat, which is less than 1 meters high and is not famous. Although the mountain is not high, it looks very strange, much like the bent wooden frame behind the horse's neck used to pull the car when it was pulled by a horse with a shaft. Because this curved wooden frame was called "Yi Mountain" in ancient times, people named this mountain "Yi Mountain" figuratively.
There are no mountains over 2, meters in Shandong, and Mount Tai is the only one, only over 1,5 meters. There are several mountains over 1, meters, such as Mengshan, Laoshan, Lushan and Yishan. It is really strange that the county town here is not named after Yishan, but is named after a few tens of meters high mountain. This is the charm of the mountain.