Beijing is about 40 times bigger than Athens.

Athens (map shows its 34 named neighbourhoods; the area covers the whole city) is approximately 412 sq km, while Beijing is approximately 16,411 sq km, making Beijing 3,883% larger than Athens.
Tip: This to-scale comparison of Athens vs. Beijing uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.