Keshan (Chinese: 克山; pinyin: Kèshān) is a county in western Heilongjiang province, China, about 100 km (62 mi) northeast of Qiqihar, which administers it. It is named from a city-shaped extinct volcano, which has a name of Erkeshan in its territory. Its total area is 3,632 square kilometres (1,402 sq mi), with a population of 460,000. Post Code: 161610. The seat of Keshan County is located in Keshan Town.