This is the complete sentence about the Western Siberian Plain:
The Western Siberian Plain is marshy in some places because it has poor natural draining systems.
What is the Western Siberian Plain?
The Western Siberian Plain is a plain that is located in the western part of Siberia and which is known because most of the plain is poorly drained and it is considered one of the largest swamps and floodplains of the world.
This is why the correct word to complete the sentence about the Western Siberian Plain is "marshy".
Check more information about the Western Siberian Plain here https://brainly.com/question/14478489
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