Potsdam is about 2.2 times smaller than Athens.

Athens (map shows its 34 named neighbourhoods; the area covers the whole city) is approximately 412 sq km, while Potsdam is approximately 188 sq km, making Potsdam 45.69% the size of Athens.
Tip: This to-scale comparison of Athens vs. Potsdam uses the Mercator projection, which distorts the size of regions near the poles.
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