Moscow is about 1.3 times bigger than Santiago.

Santiago (area of the 32 comunas of Santiago Province) is approximately 2,030 sq km, while Moscow (map shows its 125 districts within the pre-2012 boundary; the area includes New Moscow) is approximately 2,562 sq km, making Moscow 26% larger than Santiago.
Tip: This to-scale comparison of Santiago vs. Moscow uses the Mercator projection, which distorts the size of regions near the poles.
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