- Nyagan is a city located in the Khanty-Mansi Autonomous Okrug region of Russia. It has a population of approximately 53,000 people. The city was founded in 1965 as a settlement for workers in the oil and gas industry. Nyagan is known for its oil and gas production facilities and is an important industrial center in the region. The city has a cold climate with long, harsh winters and short, mild summers.