Jixi (Chinese: 鸡西; pinyin: Jīxī) is a city in southeastern Heilongjiang Province, People's Republic of China. At the 2010 census, 1,862,165 people resided within its administrative area of 22,488.47 square kilometres (8,682.85 sq mi) and 757,647 in its built-up (or metro) area made up of 3 out of 6 urban districts (including Jiguan, Hengshan and Chengzihe). Jixi is on the Muling River about 30 km (19 mi) from the border with Russia's Primorsky Krai and 120 km (75 mi) from Khanka Lake. The mayor of Jixi is Zhu Deyi (朱德义) since July 2009. The area is one of the important coal mining bases in China. A crater on asteroid 253 Mathilde was named after the city.