双峰县
Hengshan County () is a county in the Province of Hunan, China and it is under the administration of Hengyang prefecture-level city. Located in the north of Hengyang and the east-central part of Hunan province, the county is bordered to the north by Xiangtan County, to the northwest by Shuangfeng County, to the southwest and south by Hengyang County, Nanyue District and Hengnan County, to the east by Hengdong County. The county of Hengshan covers with a population of 449,500 (as of 2015). It has five townships and seven towns under its jurisdiction, the county seat is Kaiyun Town ().