also: とうごく
island country; island nation
Refers to a country consisting entirely of islands. Often used as a metaphor for Japan, highlighting its geographic isolation or maritime character.
日本はアジアの東にある島国です。
Japan is an island country in East Asia.
Being an island nation greatly influences the country's culture.
Japan is an island nation surrounded by sea on all sides.
That is said to be a culture peculiar to island nations.