The rivers of the planet are ambiguous in the nature of their flow, since it changes depending on the relief in which the river bed is located. In general terms, there are two types of rivers: plain and mountain. For lowland rivers, an even flow is characteristic, they create few meanders, the channel is wide, and the flow is slow. Typical examples of lowland rivers are Don, Amazon, Danube, etc. Mountain rivers have a fast flow, rapids and waterfalls are formed on them, the channel is often compressed between rocks, and the flow is very fast and deep.
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