Athens is about 1.9 times smaller than Augusta.

Augusta (map shows its 51 named neighbourhoods; the area covers the whole city) is approximately 783 sq km, while Athens (map shows its 34 named neighbourhoods; the area covers the whole city) is approximately 412 sq km, making Athens 52.62% the size of Augusta.
Tip: This to-scale comparison of Augusta vs. Athens uses the Mercator projection, which distorts the size of regions near the poles.
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