Obvious and different settlements happened in the west extension of the subway that is located in the stratum of Yangtze River valley flat after the construction of the subway tunneling.

南京地铁西延线位于长江漫滩饱和软粘土地层中，地铁施工完成后隧道结构出现了较大的沉降和差异沉降。

youdao

There is typical loess ravine terrain, more than ten large areas of the plateau, and is mixed plateau, ravines, girder, valley, flat plain, chain of mountains, slope in Qingyang research region.

研究区庆阳既有典型的黄土丘壑地形，又有十多个面积相对较大的塬面，高原、沟壑、梁峁、河谷、平川、山峦、斜坡兼有。

youdao

The town lay on a flat plain at the base of an Allegheny Mountain valley so steep that the hillsides rose straight upward along the Little Connemaugh River.

VOA: standard.2010.04.26

His train was high atop a slender viaduct across a flat valley, and immediately ahead of him was train D3115, moving so slowly that it might as well have been a wall.

NEWYORKER: Boss Rail

At this point you will leave the flat Platte River Valley.

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Surrounded by the Pioneer Mountains, Divide was nestled in a flat-backed valley sprinkled with sagebrush and half-burnt two-by-fours, a reminder of when people actually used to live here.

NPR: Excerpt: 'The Selected Works of T.S. Spivet'