From the Wikipedia page 
Nerchinsko-Zavodsky District (Russian: Нерчинско-Заводский райо́н) is an administrative and municipal district (raion), one of the thirty-one in Zabaykalsky Krai, Russia. It is located in the east and southeast of the krai, and borders with Gazimuro-Zavodsky District in the north, and Kalgansky District in the south. The area of the district is 9,700 square kilometers (3,700 sq mi). Its administrative center is the rural locality (a selo) of Nerchinsky Zavod.