Some river folklore creatures 

• Kelpies & Water Horses (Scotland/Ireland): Shapeshifters, often appearing as horses, that lure riders into rivers to drown them.
   

• Kappa (Japan): Green, turtle-like humanoid creatures with a water-filled dish on their heads; they are known to drag people and animals into rivers.
   

• Jenny Greenteeth (England): A river hag who pulls children into the water.
   

• Grindylow (England): Similar to a hag, these water demons use long fingers to drag victims down.
   

• Nixie/Näck (Europe): Water spirits that often lure people with music or shape-shift.
   

• Bunyip (Australia): A creature that lives in swamps/creeks and is known for eating humans.
   

• Vodianoi (Slavic): A malevolent water spirit resembling an old man with algae, scales, and a green beard.
   

• Knucker (England): Water-wyrms (dragons) that live in deep, bottomless pools.
   

• Fosse Grim (Scandinavia): A spirit that plays the violin and can teach mortals music, but might also lure them to their deaths.
   

• Zin Kibaru (Niger River): A dangerous creature that controls fish and can capsize boats.