The alphamegalog of the countries of Asia lists the largest country in Asia for each letter of the alphabet; ‘largest’ is based on the country‘s population.

Afghanistan
Bangladesh
China
(no D)
(no E)
(no F)
Georgia
Hong Kong
India
Japan
Kazakhstan
Laos
Myanmar
North Korea
Oman
Pakistan
Qatar
Russia
South Korea
Thailand
Uzbekistan
Vietnam
(no W)
(no X)
Yemen
(no Z)