Asia has different countries.
Asia is Earth 's largest and most populous continent , located primarily in the eastern and northern hemispheres and sharing the continental landmass of Eurasia with the continent of Europe and shares the continental landmass of Afro-Eurasia with both Europe and Africa . China and India alternated in being the largest economies in the world from 1 to 1800 CE . China , officially the People 's Republic of China ( PRC ) , is a unitary sovereign state in East Asia and the world 's most populous country , with a population of over 1.381 billion . India , officially the Republic of India ( Bhārat Gaṇarājya '' ) , is a country in South Asia .