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一、水系基本情况及外部条件1.基本条件黑龙江水系是我国排在长江水系、珠江水系之后第三大水系,主要由嫩江、松花江、黑龙江和乌苏里江4支河流构成。水系总通航里程为5330km,其中嫩江和松花江是我国内河,通航里程分别为888km和928km,黑龙江中上游和乌苏里江是我国与俄罗斯界河,通航里程分别为1890km和495km。黑龙江下游在俄罗斯境内,通航里程为1000km。
First, the basic situation of the water system and external conditions 1. Basic conditions Heilongjiang River in China ranked in the Yangtze River, Pearl River after the third largest water system, mainly by the Nenjiang River, Songhua River, Heilongjiang and Wusuli River 4 rivers. The total navigation mileage of the water system is 5330km, of which, Nenjiang River and Songhua River are the inland rivers of our country with navigation mileage of 888km and 928km respectively. The middle and upper reaches of Heilongjiang River and the Ussuri River are the border river between China and Russia with navigation mileage of 1890km and 495km respectively. The lower reaches of Heilongjiang in Russia, navigation mileage of 1000km.