Some Power Plant was situated in dike area of the south bank of a Yangtse River, belong in valley flat geomorphic unit.

某电厂位于长江南岸的长江大堤堤内圩区。属长江河漫滩地貌单元。厂区分布第四系冲积物及牛轭湖相沉积层， 基岩为第三系红层。

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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。

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A broad valley opened up leading to a high, flat plateau of cultivated land.

一个宽阔的山谷展开，通向一片平坦的高原耕地。

《柯林斯英汉双解大词典》

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'