The western regions are plateau and the east is lowland. The southwest region has mountains as high as 3000 metres, and is an area is known for greenest and freshest climate in all of the country.

西南区域有3000米高的山地，而且作为全国最肥沃土地和清新气候而闻名。

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The topography of this area is that of a flat arid, desert plain, surrounded by small areas of high plateau, called mesas.

这个地区由干旱的平原和沙漠组成，周围环绕着高原，即台地（mesas）。

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It is Shown by investigation data that flooded irrigation in the loess plateau area is a measure of soil conservation with less cost and high economic benefits.

调查资料表明，在黄土高原地区引洪漫灌是一项费用省、经济效益高的水保措施。

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