流域长度是指流域的轴长，即以河口为中心作同心圆，在同心圆与流域分水线相交处绘出许多割线，各割线中点的连线即为流域长度。
流域面积（集水面积） watershed area (drainage area, catchment area) 流域长度（流域轴长） length of basin 流域植被率（植被度） percentage of vegetations in drainage area ..
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这并不是俄国人第一次发现黑龙江(一种说法是黑龙江是世界第六长的河，超过湄公河和刚果河的长度，流域面积超过长江)。
It was not the first time that Russians had stumbled on the Amur, by some measures the world's sixth-longest river, longer than the Mekong or the Congo and draining a basin bigger than the Yangzi's.
它的干流长度253公里，流域面积达5543平方里，为湘江在湘北的最大支流。
The length of the trunk stream of 253 km, the basin area of 5, 543 sq. miles, for the Xiangjiang River in Xiangbei the largest tributary.
它的干流长度253公里，流域面积达5543平方里，为湘江在湘北的最大支流。
The length of the trunk stream of 253 km, the basin area of 5,543 sq. miles, for the Xiangjiang River in Xiangbei the largest tributary.
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