The name "Vanishing Triangle" refers to the triangular shape of the location in the eastern part of the island, all within the boundaries of the Leinster Province. The unofficial list for the missing women in the Vanishing Triangle consists of six women, but a total of eight women have been reported missing within the same time frame and location of the others. Some speculate that, because of the similarities and oddities of the eight women's disappearances, they all became victims to a serial killer who frequented the Leinster Province during that period.