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河北省西部山区为太行山山地丘陵区,位于北纬39°40’～41°、东经114°～116°之间,包括北至涞水、阜平,经易县、灵寿至涉县的太行山东侧山区的23个县(市)。该区海拔100～800m,地势西高东低,呈阶梯状分布。年均降水量447.6～635.1mm,有些地段降水量可达700mm以上,降水年际变化
The mountainous area in the western part of Hebei Province is the mountainous hilly area of the Taihang Mountains. It lies between 39 ° 40 ’~ 41 ° North latitude and 114 ° ~116 ° E longitude, including the northern part of Xishui, Fuping, Jingyi, Lingshou to Shexian Taihang Shandong Side of the mountain 23 counties (cities). The area of 100 ~ 800m above sea level, high terrain west east low, was ladder-like distribution. The average annual rainfall 447.6 ~ 635.1mm, precipitation in some areas up to 700mm above the interannual variability of precipitation