According to the historical data, it was an area with dense forests and grasslands, good environment and flourishing economy.

据史料考证，历史上的黄土高原曾经是林草茂盛、环境优美、经济繁荣的区域。

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In the south, the Shiwalik Hills are covered with dense forests, lowland river valleys, and mountains up to around 1,500 m above sea level.

南部的Shiwalik山区有茂密的森林、低地的河谷，每座山的海拔都在1500米之上。

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In the south, the Shiwalik Hills are covered with dense forests, lowland river valleys, and mountains up to around 1, 500 m above sea level.

南部的Shiwalik山区有茂密的森林、低地的河谷，每座山的海拔都在1500米之上。

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