Official website introduced that a local treasure in Cangzhou, the temporary sealed control area and the temporary controlled area strictly implement the sealing control measures, and the unsealing time will be notified separately.

Yanshan County, which belongs to Cangzhou City, Hebei Province, is located in the southeast of Cangzhou City, bordering Bohai Sea in the east, Beijing and Tianjin in the north and Shandong in the south. The county covers a total area of 800 square kilometers and 740,000 mu of cultivated land, and governs 6 townships, 6 towns and 450 administrative villages.