Pluto is not exactly a planet but the largest object in the Kuiper belt, as well as the tenth-most-massive body observed directly orbiting the Sun.
However, did you know that Russia, the largest country by land mass on Earth (17,098,322 square kilometers) is bigger than Pluto?
Pluto has a land mass of just 16,647,940 square kilometers!
Alex Winter says
This is out of date, the New Horizons mission proved in 2016 that Pluto is actually 17.6 million km^2, making its surface area bigger than that of Russia’s.