It comprises four main islands, dominated by Honshu, with Hokkaido to the north, Shikoku across the narrow Inland Sea, and Kyushu to the southwest.
Japan is a single island.
mnli hypothesis: Japan is a single island. premise: It comprises four main islands, dominated by Honshu, with Hokkaido to the north, Shikoku across the narrow Inland Sea, and Kyushu to the southwest.