Only has a length of about 20 meters, 15 meters wide. But various mystical stories can not be separated from the existence of this river. The name Tamborasi comes from the Tolaki language of Pomboraasi or inflammation. The name is inherent because it becomes the boundary to dispel the invaders by the previous fighters who passed in two districts (Kolaka-Kolut). Various versions of being from other worlds often appear in the river. Some people believe it to be a bridge to fulfill dreams.