Why do most people in japan live in the plains and lowlands?

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Explanation:

Most of Japan's people live on plains and lowlands found mainly along the lower courses of the country's major rivers, on the lowest slopes of mountain ranges, and along the sea coast. This concentration of people makes Japan one of the world's most crowded countries. Densities are especially high in the urban corridor between Tokyo and Kobe, where 45 percent of the country's population is packed into only 17 percent of its land area. An ethnically and culturally homogeneous nation, Japan has only a few small minority groups and just one major language Japanese.