city and port, Khanty-Mansi autonomous okrug (district), Tyumen oblast (province), west-central Russia. It lies along the right bank of the Ob River. The city grew rapidly, especially in the 1970s, as a result of the discovery of large oil fields nearby. Along with Surgut, Nizhnevartovsk is a major administrative centre of the middle Ob oil fields. It also has a gas-processing plant. Pop. (1995 est.) 237,900
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