Riyadh is about 7 times bigger than Taipei.

Taipei is approximately 272 sq km, while Riyadh (map shows its 9 named neighbourhoods; the area covers the whole city) is approximately 1,798 sq km, making Riyadh 562% larger than Taipei.
Tip: This to-scale comparison of Taipei vs. Riyadh uses the Mercator projection, which distorts the size of regions near the poles.
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