What is the largest lake on Earth. What origin has its hollow?

No matter how paradoxical this may sound, the Caspian Sea is undoubtedly the largest lake in the world. Due to its impressive size, the percentage of salts in the water and the bed, which is lined with the oceanic type of crust, the Caspian occupies an intermediate position in the classification of “lake-sea”.
The Caspian Sea has a tectonic basin of type II, that is, this lake was formed within the tectonic trough.

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