ウェブ1 日前 · Geography of Japan. Japan is an archipelagic country comprising a stratovolcanic archipelago over 3,000 km (1,900 mi) along the Pacific coast of East Asia. [8] . It consists of 14,125 islands. [9] [10] The four main islands are Hokkaido, Honshu, Kyushu, and Shikoku.