| Hengdong County | |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Pushpin Map: | China Hunan |
| Pushpin Label: | Hengdong |
| Pushpin Map Caption: | Location in Hunan |
| Subdivision Type: | Country |
| Subdivision Name: | People's Republic of China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Hunan |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Hengyang |
| Seat: | Mishui |
| Population Density Km2: | auto |
| Coordinates: | 27.0812°N 112.9531°W |
| Timezone: | China Standard |
| Utc Offset: | +8 |
Hengdong County is a county located in the east of Hengyang prefecture-level city, Hunan province, China. It was established from the eastern part of Hengshan County in 1966 and named after the east of Mount Heng. The county has an area of 1926.78km2 with a population of 746,300 (as of 2015). The county of Hengdong has two townships and 15 towns under its jurisdiction, its seat is Mishui Town (Chinese: 洣水镇).[1]
Hengdong County is located in the south of Hunan Province, between the Hengyang Basin and the Yanqi Basin in the middle reaches of the Xiang River. It borders You County to the east, the counties of Anren and Hengnan to the south, counties of Hengshan and Hengnan to the west, and counties of Xiangtan and Zhuzhou to the north.
Hengdong is named after its location that the county is located in the east of Mount Heng. The county covers an area of 1926.78km2, the longest distance is 72.9km (45.3miles) from north to south and 53.6km (33.3miles) from west to east.