The largest country in South America is BRAZIL, which has a total area of 8, 515, 767 square kilometers and a population of over 210 million people. It is the fifth largest country in the world by both area and population, and is the largest Portuguese-speaking country in the world. BRAZIL is bordered by every other South American country except for Ecuador and Chile. It is home to the Amazon Rainforest, the world's largest tropical rainforest, and is known for its diverse wildlife and culture.