関連ワード:  what percentage of japan's land is mountainous    what percentage of land area in japan is mountainous    what percentage of land area in japan is mountainous class 10    what percentage of japan's land area is covered by mountains    how many percent of japan is mountainous    how much of japan is covered by mountains    how much of japan's land is habitable    does japan have a lot of mountains  
結果 : what percentage of japan's land is mountainous