Greek Mythology: Naiads (or Naiades) are nymphs that occupy bodies of fresh water like rivers, lakes, and marshes. The Naiad is intimately connected to her body of water and her very existence depends depended on its survival. If a stream dries up, its Naiad expires. The waters over which Naiads preside are thought to be endowed with magical powers. They are in many ways female sex symbols of the ancient world and often play the part of both the seduced and the seducer.