The circle Si (泗县; Pinyin: Sì Xiàn ) is a district in the north of China's Anhui province. He belongs to the administrative area of the prefecture-level city of Suzhou (宿州). The circle Si has an area of 1,787 square kilometers and counts 860,000 inhabitants ( 2004). Its main town is the large village Sicheng (泗 城镇).
At the community level, the circle of twelve large towns and three townships is composed.