EN The Si River (Chinese: 泗水; pinyin: Sì Shuǐ) is a watercourse located in Shandong Province and, in ancient time, in Jiangsu Province, China.

EN Sizhou or Si Prefecture (泗州) was a zhou (prefecture) in imperial China seated in modern Xuyi County, Jiangsu, China or its adjacent Si County, Anhui, China.

EN Si County or Sixian is a county of Anhui Province, China, under the administration of Suzhou city.

EN Sabi was the capital of the Korean kingdom of Baekje from 538 until Baekje's fall to Silla in 660.