| Sihai Town | |
| Native Name: | 四海镇 |
| Settlement Type: | Town |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Municipality |
| Subdivision Name1: | Beijing |
| Subdivision Type2: | District |
| Subdivision Name2: | Yanqing |
| Area Total Km2: | 115.8 |
| Population Total: | 4343 |
| Population As Of: | 2020 |
| Population Density Km2: | auto |
| Coordinates: | 40.53°N 116.4069°W |
| Utc Offset: | +8 |
| Pushpin Map: | Beijing#China |
| Postal Code: | 102107 |
| Postal Code Type: | Postal code |
| Area Code: | 010 |
| Subdivision Type3: | Village-level Divisions |
| Subdivision Name3: | 1 community 18 villages |
| Timezone1: | China Standard |
| Elevation M: | 656 |
Sihai Town is a town in the Yanqing District of Beijing.[1] It borders Qianjiadian Town and Zhenzhuquan Township in the north, Liulimiao and Yanqi Towns in the east, Bohai and Jiuduhe Towns in the south, as well as Yongning Town and Liubinbao Townships in the west. Its population was 4,434 as of 2020.[2]
This region hosted a major smelter during the Yuan dynasty. With more workers immigrated here from all over China, the region was named Sihai in the sense of "People come here from all four seas/all over the world."[3]
Sihai Town sits in a basin within Yan Mountain Range, with the Caishi River flowing through it.
| Ming dynasty | Sihai Fort | |
| Qing dynasty | Sihai County, Zhili | |
| 1912 - 1951 | Sihai County, Hebei | |
| 1951 - 1952 | Yanqing County, Chahar | |
| 1952 - 1956 | Yanqing County, Hebei | |
| 1956 - 1958 | Sihai Township | |
| 1958 - 1983 | Sihai People's Commune | Yanqing County, Beijing |
| 1983 - 1995 | Sihai Township | |
| 1995 - 2015 | Sihai Town (Incorporated Heihanling Township in 1997) | |
| 2015–present | Yanqing District, Beijing |
As of the year 2021, 19 subdivisions, more specifically 1 community and 18 villages, constituted Sihai Town, They can be seen in the following table:[4]
| Subdivision Names | Name Transliterations | Type | |
|---|---|---|---|
| 四海镇 | Sihaizhen | Community | |
| 西沟里 | Xigou Li | Village | |
| 西沟外 | Xigou Wai | Village | |
| 四海 | Sihai | Village | |
| 椴木沟 | Duanmugou | Village | |
| 菜食河 | Caishihe | Village | |
| 海字口 | Haizikou | Village | |
| 岔石口 | Chashikou | Village | |
| 永安堡 | Yong'anpu | Village | |
| 郭家湾 | Guojiawan | Village | |
| 石窑 | Shiyao | Village | |
| 大胜岭 | Dashengling | Village | |
| 南湾 | Nanwan | Village | |
| 黑汉岭 | Heihanling | Village | |
| 大吉祥 | Dajixiang | Village | |
| 上花楼 | Shanghualou | Village | |
| 王顺沟 | Wangshungou | Village | |
| 前山 | Qianshan | Village | |
| 楼梁 | Louliang | Village |