The Nguma-monene is found in the Democratic Republic of the Congo. A semi-aquatic creature, it has been seen both swimming and walking on land.
The Nguma-monene has a mouth full of sharp teeth, a long tail, and a large ridge or spine running down its back. It is vicious towards hippos. Its neck is reportedly "as thick as a man's thigh".
One popular theory is that Nguma-monene is a surviving Dimetrodon or Spinosaurus. Both prehistoric creatures have spines running down there back, however, Dimetrodon wasn't aquatic. Other theories suggest an unknown form of lizard, crocodile, or snake.