Kaiyang County

Kaiyang County, on the Yunnan-Guizhou plateau in the southwestern part of China, is reputed to be the "Capital of Phosphorus" for its rich phosphorus resources. Since the establishment of Manzhou in the 4th year of the Zhenguan Reign (627--649) of the Tang Dynasty dating back nearly 1,400 years ago, it has had several names, including Guangzhou, Kaizhou and Zijiang; it was named Kaiyang County in 1930.