nasal mucus

Si County or Sixian, a county in Suzhou City 宿州市[Su4 zhou1 Shi4], Anhui

Si River in Shandong

Sishui County in Jining 濟寧|济宁[Ji3 ning2], Shandong; Surabaya, capital of East Java province of Indonesia

see 泗洪縣|泗洪县[Si4 hong2 Xian4]

see 泗陽縣|泗阳县[Si4 yang2 Xian4]

Sishui, a county in Jining City 濟寧市|济宁市[Ji3 ning2 Shi4], Shandong

Sihong, a county in Suqian City 宿遷市|宿迁市[Su4 qian1 Shi4], Jiangsu

Siyang, a county in Suqian City 宿遷市|宿迁市[Su4 qian1 Shi4], Jiangsu