The following are four largest country's in the world Russia Canada China united states what country located in south america also ranks as one of the ten largest

Brazil is the largest in South America and is one of the largest on earth.

The top ten largest countries in the world are (in order) Russia, Canada, America, China, Brazil, Australia, India, Argentina, Kazakhstan and Sudan. Therefore, the answer to your question would be Brazil, since it is the only one in South America.