47,549 km2 (18,359 sq mi) were defined according to the Treaty of Tartu in 1920 between Estonia and Soviet Russia (then under communistBolshevik revolutionary government prior to the founding of the USSR in 1922). Today, the remaining 2,323 km2 (897 sq mi) are part of the Russian Federation. The ceded areas include most of the former Petseri County and areas east of the Narva river including Ivangorod (Jaanilinn).[13]Pechory remains under Russian administration.
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