What is the reason for the strong swampiness of the West Siberian Plain?

1) The plain consists of two flat depressions.
2) The soil of the plain is highly waterlogged due to heavy rainfall, at the same time the moisture does not have time to evaporate, since the temperatures are not high enough in winter and summer.
3) The territory has been subject to long-term influence of permafrost.
4) Huge deposits of peat, absorbs and retains moisture.

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