Japan's primary territory consists of twelve islands.
Anguilla . The territory consists of the main island of Anguilla , approximately 16 miles ( 26 km ) long by 3 miles ( 5 km ) wide at its widest point , together with a number of much smaller islands and cays with no permanent population . An island country is a country whose primary territory consists of one or more islands or parts of islands . Japan . Japan is a stratovolcanic archipelago consisting of about 6,852 islands .