Hengyang, lying to the southern part of Heng Mountain, situates in the middle-southern part of Hunan province and middle part of Xiangjiang River.

• 衡阳是湖南第二个建市的城市，也是湖南的工业重镇，衡变、衡钢、衡拖、衡柴曾在一段时期内名震全国。