How are the northern part of the north european plain and the lowlands of the west siberian plain similar?

The Northern European plain and lowlands of West Siberian Plains have a lot of differences in terms of their characteristics. The only similarity between the two would be the vast complex land that both of these lands have. 

I hope this answered your question.

Both are part of the northern landforms of Russia.They are close, only separated by the Ural Mountains.Both have sources of water available.

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