Mari Depression

The Mari Depression (Марийская низменность) 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 50 m and 100 m and there are many small lakes and swamps. The area is now partly flooded by the Cheboksary Reservoir.

Dunes
There are ancient dunes covered with forests located between the rivers.