Winterthur is about 23 times smaller than London.

London (including the 32 boroughs of greater London) is approximately 1,572 sq km, while Winterthur is approximately 68 sq km, making Winterthur 4.33% the size of London.
Tip: This to-scale comparison of London vs. Winterthur uses the Mercator projection, which distorts the size of regions near the poles.
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