YOU SAID:

This is the greatest country in the world

INTO JAPANESE

これは世界で最も大きな国です

BACK INTO ENGLISH

This is the biggest country in the world

INTO JAPANESE

これは世界最大の国です

BACK INTO ENGLISH

This is the world's largest country

INTO JAPANESE

これは世界最大の国です

BACK INTO ENGLISH

This is the world's largest country