It is a stone that hollow concave shape, tapping any object emits a sound like a bell, hence their name. Being in the middle of the deep water channel ships have to pass you by taking care not to touch it by attributing special mysteries. When you step on or touch immediately begins the river (Atabapo) to pit at that moment begins a violent storm, which wrecks the boats.
When not doing the above explained and left him tribute (meat of Amazonian fauna, cassava, manioc, etc..), Was obtained on a journey without obstacles or setbacks of any kind.
Today the belief in this myth has come to the advancement of culture throughout the federal territory Amazons.
Travelers hitting fun to hear their sound characteristics and does not happen any storm.