It covers around 1,200,000 square miles.
https://www.britannica.com/place/West-Siberian-Plain
Is there multiple choice? I know one is the Gobi, and I think the other is the Taklamakan desert. But I'm not sure about the latter.
The geography of Afghanistan made it easy for our soldiers to blend in with their uniforms making it difficult to invade if you can' see who your fighting.
