Miami is about 10 times smaller than Sao Tome and Principe.

Sao Tome and Principe is approximately 964 sq km, while Miami is approximately 92 sq km, making Miami 9.59% the size of Sao Tome and Principe.
Tip: This to-scale comparison of Sao Tome and Principe vs. Miami uses the Mercator projection, which distorts the size of regions near the poles.