From the Wikipedia page 
Prionezhsky District (Russian: Прионе́жский райо́н; Karelian: Prionežjen rajon) is an administrative district (raion), one of the fifteen in the Republic of Karelia, Russia. It is located in the southeast of the republic. The area of the district is 3,665 square kilometers (1,415 sq mi). Its administrative center is the city of Petrozavodsk.