河流长度指河源到河口的长度。它是确定河流比降的基本参数。确定河流长度可以在大比例尺的地形图上，用曲线计或两脚规量取。地图的比例尺越大，量得的河长越精确。
注上星号的河流长度表示这是许多测量资料的平均值。
When the length of a river is followed by an asterisk, it is an average of multiple information sources.
探讨与香溪河具有相似纬度、相似河流长度和流域面积，同为长江上游支流的九龙河和冈曲河的大型底栖动物的群落结构特征与香溪河的差异。
The three streams had similar latitude, river length and watershed area. All were the tributaries of the Yangtse River and located in the upstream areas.
要建立一个真实的河床，确保河堤高于河流整个长度的开始点。
To create a realistic river bed, make sure that the walls of the river are above the starting point of the river for the entire length of the river.
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