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Although Japan covers a couple of thousand islands, the four main islands you can reach very easily by train as there are a few bridges and tunnels, but one can also reach them by ferry-boat. These are the main islands from north to south-west.
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北海道 ほっかいどう Hokkaidō
本州 ほんしゅう Honshū
四国 しこく Shikoku
九州 きゅうしゅう Kyūshū
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There are a few island archipelagos off the main Japanese islands. The most important of those are the Ryūkyū Islands 琉球 りゅうきゅう, of which Okinawa Island 沖縄 おきなわ is the largest.
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Lami Japan 