Zurich is about 20 times smaller than Riyadh.

Riyadh (map shows its 9 named neighbourhoods; the area covers the whole city) is approximately 1,798 sq km, while Zurich is approximately 88 sq km, making Zurich 4.89% the size of Riyadh.
Tip: This to-scale comparison of Riyadh vs. Zurich 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.