Female spirits who dwell in lakes, rivers, and streams of Russia. Their beguiling song is known to lure men to their watery graves. They are beautiful creatures with pale skin and golden or green hair. They are believed to be the restless spirits of drowned maidens, tied to the place of their deaths. Others say they are less lost souls and more malign spirits. They are known to be able to change the appearance of the landscape - often with foul purpose.