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. The village lies roughly 22 kilometres (14 mi) southwest of the administrative centre of Fuyu, and about 6 kilometres (3.7 mi) west of the main road from Qiqihar.
Its location within an ethnic township named for the Daur, Manchu, and Kirghiz peoples reflects the area's mixed cultural makeup. Sanjiazi is a small rural settlement rather than an urban centre, and the available information describes it chiefly in terms of its position relative to Fuyu and the Qiqihar road.