Hilly area - Kyuryouchi

Japanese: 丘陵地 - きゅうりょうち
Hilly area - Kyuryouchi

Mountains are not necessarily defined as being high in altitude, but as a combination of the relative height and the slopes surrounding the summit. Although there are classifications based on altitude alone, such as high mountains (over 3000m), medium mountains (1000-2000m), and low mountains (below 1000m), there are also classifications based on the amount of relief, as indicated by the difference in elevation between the main ridges and the associated main valleys, such as high relief mountains (over 1800m), medium relief mountains (900-1800m), low relief mountains (600-900m), and hills (150-600m) (according to American geographer Trewartha). Since this classification is for mountainous areas around the world, it would be easier to apply it to mountainous areas in Japan if the above classification criteria were lowered to high relief (over 1000m), medium relief (500-1000m), low relief (150-500m), and hilly area (50-150m).

*Some of the terminology that refers to "hilly areas" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…山とは必ずしも高さの大小だけではなく,相対的な高みを指し,かつ山頂を囲む斜面との組合せでできている地形をいう。 標高だけで高山(3000m以上),中山(1000~2000m),低山(1000m以下)とする区分もあるが,主要な山稜とそれに付随する主要な谷との間の高度差で示される起伏量の大小に従って,山地を大起伏山地(起伏量1800m以上),中起伏山地(900~1800m),小起伏山地(600~900m),丘陵地(150~600m)とする区分がある(アメリカの地理学者トレワーサによる)。これは世界の山地を対象にした区分なので,日本の山地に対しては上記の区分基準を下げ,大起伏(1000m以上),中起伏(500~1000m),小起伏(150~500m),丘陵地(50~150m)のようにした方が当てはめやすい。…

※「丘陵地」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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