一.引言我国东北位于蒙古高原的东面,南滨黄海渤海,东面接着朝鲜和苏联的束海滨省,北以黑龙江和苏联的东西伯利亚为界。
North-eastern China which complies six provinces and a part of Inner Mongolia is situated between latitude 38°43'N and 53°30'N, longitudes 115°23E and 135°20'E, having an area of 1,302,OOOsq. km..