华北山区位于华北平原与陕甘黄土高原以及内蒙古高原之间，是我国经济欠发达地区之一。
The mountainous area of North China is surrounded by the North China Plain, Shanxi Gansu Loess Plateau and Inner Mongolia Plateau.
资料表明，黄土高原土壤干层分布普遍，向南分布已达关中平原地区。
The results indicate that the soil-drying layer is widely distributed and has extended to the Guanzhong Plain.
在莱州湾南岸滨海平原上发现一种新地貌类型黄土阜。
The loess mounds are a newly discovered type of landforms on the Laizhou Bay Plain south of the Bohai Sea.
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