The Mari Depression () is a depression in Gornomariysky District, Mari El, Russian Federation. Geography The depression is located on the left side of the Volga, from the western borders of the Mari El to the Bolshaya Kokshaga River. The average height of the depression is between and and there are many small lakes and swamps.Марийская низменность, Great Soviet Encyclopedia in 30 vols. / Ch. ed. A.M. Prokhorov . - 3rd ed. - M, 1969-1978. The area is now partly flooded by the Cheboksary Reservoir, which dams the Volga. Dunes There are ancient dunes covered with forests located between the rivers.
References
БСЭ: Марийская низменность