Sao Paulo is around the same size as Johannesburg.

Johannesburg is approximately 1,644 sq km, while Sao Paulo is approximately 1,523 sq km, making Sao Paulo 92.64% the size of Johannesburg.
Tip: This to-scale comparison of Johannesburg vs. Sao Paulo uses the Mercator projection, which distorts the size of regions near the poles.
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