History of Japan Ancient Japan to 1185

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The reopening of the country ushered in contact with the West and a time of unprecedented change. Japan sought to become a modern industrialized nation and pursued the acquisition of a large overseas empire, initially in Korea and China. By late 1941 this latter policy caused direct confrontation with the United States and its allies and to defeat in World War II (1939–45). Since the war, however, Japan’s spectacular economic growth—one of the greatest of any nation in that period—brought the country to the forefront of the world economy. It now is one of the world’s foremost manufacturing countries and traders of goods and is a global financial leader.
Akira WatanabeGil Latz

Land

Japan is bounded to the west by the Sea of Japan (East Sea), which separates it from the eastern shores of South and North Korea and southeastern Siberia (Russia); to the north by La Perouse (Sōya) Strait, separating it from Russian-held Sakhalin Island, and by the Sea of Okhotsk; to the northeast by the southern Kuril Islands (since World War II under Soviet and then Russian administration); to the east and south by the Pacific; and to the southwest by the East China Sea, which separates it from China. The island of Tsushima lies between northwestern Kyushu and southeastern South Korea and defines the Korea Strait on the Korean side and the Tsushima Strait on the Japanese side
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Geologic framework

Mount Fuji
Japan is one of the world’s most geologically unstable areas. The country experiences some 1,000 tremors annually, most of them minor, though major quakes—as in Tokyo-Yokohama in 1923 and Kōbe in 1995—cause considerable loss of life and widespread destruction. Violent volcanic eruptions occur frequently, and at least 60 volcanoes have been active within historical time. Volcanoes born since 1900 include Shōwa Volcano on Hokkaido and Myōjin Rock off the Beyoneisu (or Bayonnaise) Rocks in the Pacific. Among the major eruptions since 1980 are those of Mounts O (1983) and Mihara (1986) in the Izu Islands and Mount Unzen (1991) in Kyushu. The country’s abundant hot springs are mostly of volcanic origin. Many of the gigantic volcanoes are conical in shape (e.g., Mount Fuji), while others form steep lava domes (e.g., Mounts Dai and Unzen). Conspicuous shield volcanoes (broad, gently sloping volcanic cones) are rare, and extensive lava plateaus are lacking. One of the characteristics of the volcanic areas is the prevalence of calderas (large, circular, basin-shaped volcanic depressions), especially in the northeast and southwest, many of which are filled with water, such as Lakes Kutcharo, Towada, and Ashi.
The cause of this instability—indeed, the reason for Japan’s existence—is the tectonic movement of several of the Earth’s major crustal plates in the vicinity of the archipelago. Most important is the subduction (sinking) of the Pacific Plate (in the north) and the Philippine Plate (in the south) beneath the Eurasian Plate, upon which Japan lies. The movements of these plates have formed six mountain arcs off the northeastern coast of Asia: from northeast to southwest, the Chishima Range of the Kuril Islands; the Karafuto (Sakhalin) Mountain system of Hokkaido; the Northeast, Southwest, and Shichito-Mariana ranges of Honshu; and the Ryukyu Island formations.