Yan Mountains

…dawn of Chinese history, the Yan range has constituted a formidable barrier between the North China Plain to the south, the Mongolian Plateau to the north, and the Liao River Plain in the southern region of the Northeast (historically Manchuria). A few passes, however, cut through the ranges—the most important…

It is bounded by the Yan Mountains on the north, the Taihang Mountains to the west, and the Bo Hai to the east. The mountains have at their base a string of alluvial fans. This inner belt of the Hebei Plain is generally well drained. Until the late 20th century…