Mali is about 25 times bigger than Dominican Republic.

Dominican Republic is approximately 48,670 sq km, while Mali is approximately 1,240,192 sq km, making Mali 2,448% larger than Dominican Republic. Meanwhile, the population of Dominican Republic is ~10.7 million people (10.0 million more people live in Mali).
Tip: This to-scale comparison of Dominican Republic vs. Mali uses the Mercator projection, which distorts the size of regions near the poles.