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Russia is the largest country by geographical area. 

China is the country with the largest population (through 2012).

Russia at 6,592,800 sq. mi. (17,075,400 sq km) is the largest country in the world. Measured by land mass, Russia is the largest country in the world. It encompasses roughly 11.5% of our planet. 

The second closest country by land mass is Canada, which is actually larger than the United States. It encompasses 6.7% of the planet.