 To the east its natural border is defined by the Oka-Don Lowland and to the west there is the Dnieper Lowland.Most of the upland lies within the borders of Russia, hence its name.The Voronezh Massif is part of the East European Craton and southwesterly descends towards the Dnieper-Donets Through (Depression) which along with Prypiat Through forms the Prypiat-Dniper-Donets aulacogen.