Sanjiazi is a village in Youyi Daur, Manchu, and Kirghiz Ethnic Township, Fuyu County, Qiqihar, Heilongjiang, China. It is also known by the name Ilanbotokso. It lies in the far northeast of the country, in Heilongjiang Province.
The village is located about 22 kilometres (14 mi) southwest of the administrative center of Fuyu, and about 6 kilometres (3.7 mi) west of the main road from Qiqihar. Its position places it within a rural township established for several ethnic groups, including Daur, Manchu, and Kirghiz residents.