Oyster Beach

　　Introduction       Distributed in the southern part of Baodi County and the central and eastern regions of Ninghe County. Like shell ridges, it is also an ancient marine relic, but differs in that it is formed by the accumulation of oyster shells, reflecting changes in ancient bays. The oyster beaches in Tianjin are rare in the world both in terms of area and thickness. For example, the river section between Shizhuangzi and Jiangzhuangzi in Dongjietuo Township, western Ninghe County, as well as Peizhuang near the Beijing-Shan Railway in eastern Ninghe County, both feature oyster beaches with unparalleled scale, profile layer thickness, clarity, and shell length. They hold valuable research significance for disciplines such as marine ecology and sea-land transitions.

　　 Tianjin Ninghe County