Russian Federation is the top country by surface area in the world. As of 2015, surface area in Russian Federation was 17.1 million sq. km that accounts for 12.78 % of the world's surface area. The top 5 countries (others are Canada, the United States of America, China, and Brazil) account for 41.09 % of it. The world's total surface area was estimated at 133 million sq. km in 2015.
Surface area is a country's total area, including areas under inland bodies of water and some coastal waterways.