Q: What is the largest below-sea-level depression by surface area?
A: Caspian Depression, Kazakhstan and Russia
This depression is a low-lying flatland region encompassing the northern part of the Caspian Sea, the largest enclosed body of water on Earth. It has an area of approximately 200,000 square kilometers or 77,000 square miles of land below sea level. The depression lies at the southern end of the Ryn Desert, and is in both Kazakhstan and Russia. Both the Ural and Volga rivers flow through the depression into the Caspian Sea.
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