The Hague (Den Haag) is about 20 times smaller than Johannesburg.

Johannesburg is approximately 1,644 sq km, while The Hague (Den Haag) (excluding the city's 15.68 sq km of water area) is approximately 82 sq km, making The Hague (Den Haag) 5.02% the size of Johannesburg.
Tip: This to-scale comparison of Johannesburg vs. The Hague (Den Haag) 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.