Peg Powler is a hag and water spirit in English folklore who inhabits the River Tees. Similar to the Grindylow, Jenny Greenteeth, and Nelly Longarms, she drags children into the water if they get too close to the edge. She is regarded as a bogeyman figure who is invoked by parents to frighten children into proper behavior. The 19th century folklorist William Henderson describes Peg Powler as having green hair and "an insatiable desire for human life" and she is said to lure people into the river to drown or be devoured. The foam or froth which is often seen floating on certain parts of the Tees is called "Peg Powler's suds" or "Peg Powler's cream".