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一、自然地理概况海滦河流域位于东经112°～120°,北纬35°～43°之间。东临渤海,西靠太岳,北倚蒙古高原,南以黄河为界,包括北京、天津两市的全部,河北省大部,山西、山东、河南、辽宁诸省及内蒙古自治区的一部分,流域面积31.9万公里~2。流域西侧有南北向的太行山脉,山高坡陡,连绵不断;流域北部有东西向的燕山山脉,较太行山略低,山形较为破碎。太行、燕山之间,以军都山为过渡,形成流域的北部,西部为山地(约占全流域的60％)海拔约1000～2000米,东部、南部为平原(约占40％)海拔约4～50米。流域南端的黄河北岸地势
I. Overview of Natural Geography The Hailuan River Basin is located between 112 ° ~ 120 ° East longitude and 35 ° ~ 43 ° North latitude. East Bohai Sea, Taiyue west, north of the Mongolian Plateau, the South Yellow River bounded, including Beijing, Tianjin, all the two cities, most of Hebei Province, Shanxi, Shandong, Henan, Liaoning Provinces and Inner Mongolia Autonomous Region part of the basin Area of 319000 km ~ 2. There is a north-south Taihang mountain range on the west side of the basin, steep and steep mountain slopes, and an east-west Yanshan mountain range in the north of the valley, slightly lower than the Taihang Mountain. Taihang, Yanshan, and Jundu Mountain, forming the northern part of the basin. The western part is a mountainous area (about 60% of the whole basin) with an altitude of about 1000-2000 meters above sea level. The eastern part and the southern part are plains (about 40%). 4 ~ 50 meters. The southern tip of the Yellow River basin north shore topography