Specific reasons:

"Jiangbei" in Harbin means that the Songhua River is the boundary, and the place north of Songhua River is called Jiangbei as long as it is under the jurisdiction of Harbin. The landmark areas include Sun Island, Harbin Municipal Government and Jiangbei University Town. Suihua City, located in the southwest of central Heilongjiang Province, is a prefecture-level city under Heilongjiang Province.

Introduction to suihua:

Suihua City is located in the Hulan River Basin of Songnen Plain in the south-central part of Heilongjiang Province, bordering Heihe City, the port city of China and Russia in the north, Yichun City, the capital city of Dulin in the east, Harbin City, the capital city in the south, Daqing City, the petroleum industrial city in the southwest, and Qiqihar City, the second largest city in Heilongjiang Province in the southeast. Its geographical outline is like a carp jumping to the west foot of Xiaoxing 'anling at the confluence of Songhua River and Nenjiang River. Suihua, known as "Jiangbei", is an important agricultural city and transportation hub city in Heilongjiang Province, and also an important commodity grain base, herbivorous animal husbandry base, agricultural and animal husbandry product base and green food base in China.