1. Presence of cataracts and waterfalls making them impassable by ships e.g Rivers Zambezi, Congo and Nile
2. Shallow waters
3. Dense forests along the rivers which have dangerous animals like crocodiles and hippos
4. Some rivers are seasonal and narrow
5. Some contain debris which impedes navigation
-Fluctuation of water levels
-River channels have numerous rock outcrop
-Rugged terrain with numerous steep slopes – presence of waterfalls, rapids, and cataracts.
-Some rivers have shallow waters
-Some rivers have floating vegetation
-Some rivers have narrow channels –unsuitable for sailing
elton17401 answered the question on December 8, 2017 at 16:07
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