Chengshan is a town in Rongcheng City, which is part of Weihai prefecture-level city in eastern Shandong province, China. It is located on the Shandong Peninsula, the easternmost part of the province, which projects into the Yellow Sea.
The town falls under the administration of Rongcheng, a county-level city within Weihai. This places Chengshan in one of China's easternmost coastal areas, a region long associated with fishing and maritime activity along the Shandong coast.