Chemnitz is around the same size as Dusseldorf.

Dusseldorf is approximately 217 sq km, while Chemnitz is approximately 221 sq km, making Chemnitz 2% larger than Dusseldorf.
Tip: This to-scale comparison of Dusseldorf vs. Chemnitz uses the Mercator projection, which distorts the size of regions near the poles.
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