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Japan Geography
 
 
 

Japan, a country of islands, extends along the eastern or Pacific coast of Asia. The main islands, running from north to south, are Hokkaido, Honshu (or the mainland), Shikoku, and Kyushu. Naha in the Ryukyu archipelago is over 600 kilometres (375 mi) to the southwest of Kyushu. In addition, about 3,000 smaller islands may be counted in the full extent of the archipelago.

Japan is the 18th most densely populated country in the world. About 73% of the country is mountainous, and unsuitable for agricultural, industrial, or residential use, due to the generally steep elevations, climate, and risk of landslides caused by earthquakes, soft ground, and heavy rain. This has resulted in an extremely high population density in the habitable zones that are mainly located in coastal areas.

Its location on the Pacific Ring of Fire, at the juncture of three tectonic plates, gives Japan frequent low-intensity earth tremors and occasional volcanic activity. Destructive earthquakes, often resulting in tsunamis, occur several times each century. The most recent major quakes include the 2004 Chuetsu Earthquake and the Great Hanshin Earthquake of 1995. Hot springs are numerous, and have been developed as resorts.

The climate of Japan is predominantly temperate but varies greatly from north to south. Japan's geographical features divide it into six principal climatic zones:

Hokkaido: The northernmost zone has a temperate climate with long, cold winters and cool summers. Precipitation is not heavy, but the islands usually develop deep snow banks in the winter.

Sea of Japan: On Honshu's west coast, the northwest wind in the wintertime brings heavy snowfall. In the summer, the region is cooler than the Pacific area, though it sometimes experiences extremely hot temperatures, due to the Föhn wind phenomenon.

Central Highlands: A typical inland climate, with large temperature differences between summer and winter, and between day and night. Precipitation is light.

Seto Inland Sea: The mountains of the Chugoku and Shikoku regions shelter the region from the seasonal winds, bringing mild weather throughout the year.

Pacific Ocean: The east coast experiences cold winters with little snowfall and hot, humid summers due to the southeast seasonal wind.

Southwest Islands: The Ryukyu Islands have a subtropical climate, with warm winters and hot summers. Precipitation is very heavy, especially during the rainy season. Typhoons are common.

The main rainy season begins in early May in Okinawa, and the stationary rain front responsible for this gradually works its way north until it dissipates in northern Japan before reaching Hokkaido in late July. In most of Honshu, the rainy season begins before the middle of June and lasts about six weeks. In late summer and early autumn, typhoons often bring heavy rain.

Japan is home to nine forest ecoregions which reflect the climate and geography of the islands. They range from subtropical moist broadleaf forests in the Ryukyu and Bonin islands, to temperate broadleaf and mixed forests in the mild climate regions of the main islands, to temperate coniferous forests in the cold, winter portions of the northern islands.

Subdivisions

Japan is divided into 47 prefectures, which are commonly grouped into regions. Honshu, by far the largest and most populated island, is typically divided into five (or more) regions. The other major islands constitute one region each. From north to south, the regions are:

Region Prefectures
Hokkaido Hokkaido
Tohoku Akita, Aomori, Fukushima, Iwate, Miyagi, Yamagata
Kanto Chiba, Ibaraki, Kanagawa, Saitama, Tochigi, Tokyo
Chubu Aichi, Fukui, Gifu, Ishikawa, Nagano, Niigata, Shizuoka, Toyama, Yamanashi
Kinki Hyogo, Kyoto, Mie, Nara, Osaka, Shiga, Wakayama
Chugoku Hiroshima, Okayama, Shimane, Tottori, Yamaguchi
Shikoku Ehime, Kagawa, Kochi, Tokushima
Kyushu Fukuoka, Kagoshima, Kumamoto, Miyazaki, Nagasaki, Oita, Saga
Okinawa Okinawa

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