1 prefectures
Hokkaido combines major city gateways with broad agricultural landscapes, port heritage, volcanic lakes and mountain districts. Sapporo, Otaru, Furano, Biei and Hakodate offer different travel rhythms, so a regional plan should be built around current rail, flight and road conditions rather than a single circuit.
6 prefectures
Tohoku stretches from Pacific and Sea of Japan coasts to inland basins and volcanic ranges. Its six prefectures connect archaeological sites, castle towns, temple landscapes, hot-spring districts and working regional cities, with Sendai serving as an important southern gateway.
7 prefectures
Kanto places Tokyo's dense rail network beside temple cities, port districts, coastal peninsulas, mountain resorts and science or craft towns. The seven prefectures support both car-free city exploration and carefully planned excursions that begin from Tokyo, Yokohama, Narita or other regional hubs.
9 prefectures
Chubu spans the Sea of Japan coast, the Japanese Alps, the Fuji area and the Pacific urban corridor. Nine prefectures bring together castle and post towns, alpine routes, craft districts, tea landscapes, island connections and major gateways at Nagoya, Niigata, Kanazawa and Shizuoka.
7 prefectures
Kansai combines historic capitals, active port and commercial cities, Lake Biwa, the Kii Peninsula and inland castle or hot-spring districts. Seven prefectures support journeys that pair Kyoto, Osaka and Nara with quieter coast, pilgrimage, craft and rural landscapes.
5 prefectures
Chugoku runs between the Sea of Japan and the Seto Inland Sea, linking dunes, shrine and castle towns, historic merchant districts, peace heritage, island gateways and limestone landscapes. Hiroshima and Okayama are strong rail anchors, while northern and western areas need more deliberate sequencing.
4 prefectures
Shikoku's four prefectures combine pilgrimage heritage, inland valleys, Seto Inland Sea islands, castle towns and a Pacific coast shaped by rivers and capes. Takamatsu, Matsuyama, Tokushima and Kochi provide distinct gateways, while bridges and ferries connect selected approaches from Honshu and Kyushu.
8 prefectures
Kyushu and Okinawa connect volcanic highlands, hot-spring towns, ceramics districts, historic ports, southern coasts and subtropical island culture. Fukuoka, Nagasaki, Kumamoto, Kagoshima and Naha form different gateway systems, so island and mainland journeys should be planned as separate transport contexts.