Sihai Town (simplified Chinese: 四海镇; traditional Chinese: 四海鎮; pinyin: Sìhǎi Zhèn) is a town in the Yanqing District of Beijing.

[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 (Chinese: 四海; lit.

"[3] Sihai Town sits in a basin within Yan Mountain Range, with the Caishi River flowing through it.

(Incorporated Heihanling Township in 1997) 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]