Mainland Japan, Main territory covering Hokkaido, Honshu, Shikoku, and Kyushu in Japan
Mainland Japan consists of four main islands - Hokkaido, Honshu, Shikoku, and Kyushu - linked by bridges and tunnels into one connected landmass. Mountains cover much of the terrain, shaping where people live, how they travel, and what resources are available in each area.
Settlement of these four islands began many centuries ago and led to the formation of a unified state under imperial rule. This imperial system continues to shape the political structure today.
Each region has its own customs and ways of living that show up in local festivals, crafts, and food. These differences come from the history and geography of each island and still shape how people live today.
The territory is divided into 47 administrative regions made up of cities, towns, and villages that make travel and navigation straightforward. A dense network of trains, roads, and local transport connects the different areas together.
Though the four islands are separated by water, modern engineering like underwater tunnels and long bridges make them function as one connected system. These connections have made it possible for people to move and work between islands as easily as within a city.
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