From the Wikipedia page 
Monastyrshchinsky District (Russian: Монасты́рщинский райо́н) is an administrative and municipal district (raion), one of the twenty-five in Smolensk Oblast, Russia. It is located in the west of the oblast and borders with Smolensky District in the north, Pochinkovsky District in the east, Khislavichsky District in the south, Mstsislaw District of Mogilev Region of Belarus in the west, and with Krasninsky District in the northwest. The area of the district is 1,513.75 square kilometers (584.46 sq mi). Its administrative center is the urban locality (a settlement) of Monastyrshchina.