一、解放前雁北地区的自然概况雁北专区是个小地方,全区现有12县,168万人。忙于桑干河流域上游,雁门关以北,外长城以南,东有恒山主峯,西有红桃山,地势为西北高,东南低,西、北两面多为黄土丘陵区,东、南两面多为半石山区和石山区,全区总土地面积为3,750万亩(其中耕地1,150万亩)其中山区为2,580万亩,占总土地面积 First, natural conditions before the liberation of Yanbei area Yanbei area is a small place, the region’s existing 12 counties, 1.68 million people. Busy in the upper reaches of the Sanggan River Basin, north of Yanmenguan, south of the Great Wall, east of Hengshan main peak, west of the red peach Hill, terrain northwest high, low southeast, mostly on the west and north of Loess Hilly, east and south on both sides For the semi-mountainous area and Shishan District, the total land area of ​​the region is 37,500,000 mu (including 11,500,000 mu of cultivated land), of which 25,800,000 mu are in mountainous area, accounting for the total land area