Heihe (Chinese: 黑河; pinyin: Hēihé; lit. 'Black River'; Russian: Хэйхэ) is a prefecture-level city of northern Heilongjiang province, China, located on the Russian border, on the south bank of the Amur (Heilong) River, across the river from Blagoveshchensk. At the 2020 census, 1,286,401 people lived in the prefecture-level city of whom 223,832 lived in the built-up area (or metro) made of Aihui District.At the end of 2024, the resident population of the city will be 1.23 million, including 823,000 in urban areas and 407,000 in rural areas.
Heihe marks the northeast terminus of the diagonal Heihe–Tengchong Line, which is sometimes used to divide China into east and west.