Question

Four fifths of Japan is covered with these.

Answer 1

Mountains

Step-by-step explanation:

About 73 percent is mountainous, with a mountain range running through each of the main island. Japan highest mountain is Mount Fuji, with an elevation of 3,776m (12,388 ft)

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Answer 2

Almost four-fifths of Japan is covered with mountains. The Japanese Alps run down the center of the largest island, Honshu.