The subducting plates, being deeper than the Eurasian plate, pulled parts of Japan which become modern Chūgoku region and Kyushu eastward, opening the Sea of Japan (simultaneously with the Sea of Okhotsk) around 15-20 million years ago, with likely freshwater lake state before the sea has rushed in.Around 16 million years ago, in the Miocene period, a peninsula attached to the eastern coast of the Eurasian continent was well formed.The Tokyo Osaka-Kyoto area is the core of Honshu and Japan.

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About 11 million years before present, the parts of Japan which become modern Tōhoku and Hokkaido were gradually uplifted from the seafloor, and terranes of Chūbu region were gradually accreted from the colliding island chains.

The Strait of Tartary and the Korea Strait opened much later, about 2 million years ago.

It has a total area of 13,761 square miles (35,640 sq km) and a 2016 population estimate of 12,970,479.

Since it is in southern Japan, Kyushu has a subtropical climate and its inhabitants produce a variety of agricultural products.

The subducting plates, being deeper than the Eurasian plate, pulled Japan eastward, opening the Sea of Japan around 15 million years ago.

The Strait of Tartary and the Korea Strait opened much later.

Japan is situated in a volcanic zone on the Pacific Ring of Fire.

Frequent low intensity earth tremors and occasional volcanic activity are felt throughout the islands.

Honshu has a total area of 88,017 square miles (227,962 sq km) and it is the world's seventh largest island.