This is a place on the nearby planet, it is a tourist spot for them. The aliens call this place as 'Devil's Legs'. They have a story for this spot. once upon a time an evil-minded giant came from nowhere to attack them. Many died, many were eaten by that devil. The aliens were terrified and thought they are facing the end of their alienity.
But, suddenly the soil started to quake and the devil fell upside down into a huge crack, immediately the soil covered him along with water inside, being the upper body fully immersed in water and soil the devil suffocated and died and turned into stone. The giant was two hundred times bigger than the alien people.