Yilan County is a county of Heilongjiang Province, Northeast China, it is under the administration of the prefecture-level city of Harbin, the capital of Heilongjiang. It is more than 240 kilometres (150 mi) to the east-northeast of central Harbin. Its county seat, which is also called Yilan, is located near the confluence of the Mudan River with the Sungari, near the eponymous Yilan crater. The easternmost county-level division of Harbin City, it borders Fangzheng County to the southwest, Tonghe County to the west, as well as the prefecture-level cities of Yichun to the north, Jiamusi to the northeast, Qitaihe to the southeast, and Mudanjiang to the south.