It is the fear of rivers, of navigating a river. From the Greek 960; 959; 964; 945; 956; 959; 962; ( potamós "river" ) 966; 959; 946; 959; 962; ( fovos "fear") . See thalassophobia ("fear of the sea").
It is the exaggerated fear of rivers and water currents.
POTAMOPHOBIA of Greek potamos, 'river' and phobos 'fear, hatred' irrational and sickly fear of water currents, such as rivers and waterfalls.