Japan is an island nation located off the northeast coast of the mainland of Asia, lie in teh North Pacific Ocean, separated from Asia by the Sea of Japan (East Sea). Japan has thousands of tiny islands, but ther are four main ones: Honshu, Hokkaido, Kyushu and Shikoku. Mountains cover about three-fourths of Japan. The most famous mountain is the majestic Fuji, a dormant volcano on Honshu.