Transvolga Region or Transvolga is a territory to the East of Volga River

Volga River

The Volga is the largest river in Europe in terms of length, discharge, and watershed. It flows through central Russia, and is widely viewed as the national river of Russia. Out of the twenty largest cities of Russia, eleven, including the capital Moscow, are situated in the Volga's drainage...

 bounded by Volga, Ural Mountains

Ural Mountains

The Ural Mountains , or simply the Urals, are a mountain range that runs approximately from north to south through western Russia, from the coast of the Arctic Ocean to the Ural River and northwestern Kazakhstan. Their eastern side is usually considered the natural boundary between Europe and Asia...

, Northern Ridge

Northern Ridge

The Northern Ridge, Northern Uvaly, Severnyye Uvaly , is the chain of hills in the northern part of the East European Plain in Russia. The Northern Ridge divides the river basins of the Northern Dvina River and the Volga River...

, and Caspian Depression

Caspian Depression

Caspian Depression or Pricaspian/Peri-Caspian Depression/Lowland is a low-lying flatland region encompassing the northern part of the Caspian Sea, the largest enclosed body of water on Earth. It is the larger northern part of the wider Aral-Caspian Depression around the Aral and Caspian seas.The...

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The region is traditionally subdivided into the elevated High Transvolga (Высокое Заволжье) in the East and the lowland

Lowland

In physical geography, a lowland is any broad expanse of land with a general low level. The term is thus applied to the landward portion of the upward slope from oceanic depths to continental highlands, to a region of depression in the interior of a mountainous region, to a plain of denudation, or...

 Low Transvolga (Низкое Заволжье) by the left bank of Volga between Kazan

Kazan

Kazan is the capital and largest city of the Republic of Tatarstan, Russia. With a population of 1,143,546 , it is the eighth most populous city in Russia. Kazan lies at the confluence of the Volga and Kazanka Rivers in European Russia. In April 2009, the Russian Patent Office granted Kazan the...

 and Kamyshin

Kamyshin

Kamyshin is a city in Volgograd Oblast, Russia, located on the right bank of the Volgograd Reservoir of the Volga River, in the estuary of the Kamyshinka River. Population: 101,000 ; 24,000 ....

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The region includes Volga-Ural petroleum and gas province.

Kuybyshev Reservoir is within the Low Transvolga.