4 sentences

1. 黄河流域是中华文明的摇篮。

   Huáng Hé liú​yù shì Zhōng​huá wén​míng de yáo​lán.

   The Yellow River basin is the cradle of Chinese civilization.

   Source: Dong Chinese Dictionary

2. 淮河流域是中国重要的农业产区。

   Huái Hé liú​yù shì Zhōng​guó zhòng​yào de nóng​yè chǎn​qū.

   The Huai River basin is an important agricultural region in China.

   Source: Dong Chinese Dictionary

3. 长江流域是中国人口最密集的地区之一。

   Cháng Jiāng liú​yù shì Zhōng​guó rén​kǒu zuì mì​jí de dì​qū zhī​yī.

   The Yangtze River basin is one of the most densely populated areas in China.

   Source: Dong Chinese Dictionary

4. 上海的发展带动了长江流域广阔的经济腹地。

   Shàng​hǎi de fā​zhǎn dài​dòng le Cháng Jiāng liú​yù guǎng​kuò de jīng​jì fù​dì.

   Shanghai's development has driven the vast economic hinterland of the Yangtze River basin.

   Source: Dong Chinese Dictionary