Jianghua Yao Autonomous County Shuikou Zhongxin Leather Factory. According to Sohu. Shuikou Zhongxin Leather Factory is the largest leather factory in Shuikou Town, Jianghua, Yongzhou. Jianghua Yao Autonomous County is a county under the jurisdiction of Yongzhou City, Hunan Province. Located at the junction of Hunan, Guangdong and Guangxi provinces, adjacent to Guangdong and Guangxi counties.