United States

The United States ranks fifth with a total area of 9,525,067 km², but its landmass is only 1.1% smaller than China's, underscoring how tightly contested the top five nations are. This relatively narrow gap of 109,325 km² means the U.S. is larger than the typical rival by roughly the size of Iceland. It also outpaces #6 Brazil by over 1 million km², a difference that highlights the significant drop in area after the top five. The U.S. contains diverse geography, from tundra in Alaska to subtropical wetlands in Florida, spanning 3.8 million square miles of land and water combined.