Hag Stones also know as "Holey Stones" "Adder Stones" "Witches Stones" are stones with holes made from the natural pressure of water tides and wind. Hag Stones are typically found near rivers, and beaches. Hag Stones are used to ward off evil spirits, provide protection from hexes, curses, illness, and nightmares. Ancient witches were known to also use Hag Stones as windows or doorways to other worlds.