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东北地区包括辽宁、吉林、黑龙江等3个省和内蒙古自治区东部三盟一市,总面积124万平方公里。本区东、西、北三面分别有长白山地、冀北辽西山地和大小兴安岭山地,南部临海,中部为松辽平原,是农牧业发达的地区、商品粮基地,又是工业发达的地区。整个地区山地占56%,丘陵及高平原占18%,平原占26%。东北大部属温带大陆性季风气候区。降雨量分布,西部少东部多,从350毫米到1100毫米,松辽平原约350～700毫米。年降雨集中于6～9月,占70～80%,常发生春旱夏涝。建国以来,大体从1953年到1965年是丰水期,洪涝
Northeast China includes Liaoning, Jilin, Heilongjiang and other three provinces and Inner Mongolia Autonomous Region in the eastern League of three cities, with a total area of 1.24 million square kilometers. The east, west and north sides of the area are respectively Changbai Mountain, Liaoxi Mountain in North Hebei Province, Mountain in the Greater Xinguang Mountains and Linhai in the south, and the Songliao Plain in the middle. It is also a well-developed agricultural and animal husbandry area and a developed industrial area. The mountainous region occupies 56%, hilly and high plain 18%, plains 26%. Most of the northeastern temperate continental monsoon climate zone. Rainfall distribution, the western part of the less eastern, from 350 mm to 1100 mm, Songliao plain about 350 to 700 mm. Annual rainfall concentrated in June to September, accounting for 70 to 80%, often occur in spring and summer floods. Since the founding of the People’s Republic, generally from 1953 to 1965, there was a flood season with heavy flooding