Russia is not only the largest country in the world, but also the country with the largest forest area. The forest area of Russia alone is the size of the entire continent of Australia! 2. Brazil â 4,776,980 km2 (1,844,402 mi2) which are 56.10% of the total land area of Brazil. Brazil is the fifth largest country in the world and over than half of itâs size is forested area, large part of which is the amazon area and its rainforest. The forest area of Brazil is larger than India.