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Russia, at about 17.1 million km², would cover roughly 12% of the surface of Mars, which is about 144.4 million km². The USA would cover about 7% and Africa about 21%. Mars looks small next to Earth, yet the whole surface of Mars is about the same size as all of Earth's dry land.

Russia on Mars in TrueSize.
Mars has a radius of 3,389.5 km, which makes it about 0.53 times as wide as Earth. Its surface area is about 144.4 million km². Earth's land area is about 148.9 million km², or about 103% of Mars.
| Region | Area | Share of the surface of Mars |
|---|---|---|
| Russia | about 17.1 million km² | about 11.8% |
| United States | about 9.83 million km² | about 6.8% |
| China | about 9.6 million km² | about 6.6% |
| Africa | about 30.37 million km² | about 21% |
Country areas are well-known published totals. The area of Mars is calculated from its radius.
Mars is half as wide as Earth, but its surface is only about 28% of Earth's surface. Earth is mostly ocean, so its dry land (148.9 million km²) is about the same size as the whole surface of Mars (144.4 million km²). That makes Mars a handy size check.
A flat map also exaggerates Russia, because most of the country lies far north. On a Mercator map it looks enormous. In TrueSize the region keeps its real area, and the globe view of the planet avoids polar stretching.

The USA, Russia and China spread apart on Mars.
Open the three-country map in TrueSize
Together these three countries cover about 25% of Mars.
Stats is not available while a planet is shown, so check Tools → Stats before opening Planets.
Planet mode works on the web version. While a planet is shown, the address bar holds a link to this view that you can copy.
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