Background. The Oka-Don Plain is located in the north-west of Penza region. The vegetation of the territory is represented mainly by forests: secondary forests predominate. deciduous forests with a high proportion of pedunculate oak make up about 10%. https://www.hindigyanvishv.com/top-super-Centehua-Distressed-Southwestern-Aztec-Area-Rug-special-buy/