It's not high mountains and deep valleys that best serve to defend a country.

固国不以山溪之险。

《新英汉大辞典》

You soar effortlessly over high mountains and deep valleys. You really see the shape of the land.

你毫不费劲地飞越高山幽谷，你确能饱览大地的风貌。

youdao

Of course, wind and sun out in the open seas, over high mountains and across protected regions would not be available.

当然，在大洋、高山和保护区域的风力和阳光是采集不到的。

youdao

High in those mountains, behind a crude earthen dam, wealthy Pittsburgh industrialists and their friends sailed yachts on a pretty private lake.

VOA: standard.2010.04.26

When the French came to Laos, they climbed the high mountains and they saw the cool of the land.

NPR: Excerpt: 'The Latehomecomer'

The sunny island with high mountains and deep valleys also provides herbs and aromatic plants, fruit trees and vegetables, wheat and barley.

NPR: Crete: Ancient Diet with Modern Message

As one of the most biodiverse places on the planet, supporting jungle, high mountains and coastal desert, Peru calls upon a formidable stash of raw materials to concoct its cuisine.

BBC: Peru��s gastronomic renaissance