Rev 17:9-11

9“This calls for a mind that has wisdom: the seven heads are seven mountains on which the woman is seated; also, they are seven kings,10of whom five have fallen, one is living, and the other has not yet come; and when he comes, he must remain only a little while.11As for the beast that was and is not, it is an eighth but it belongs to the seven, and it goes to destruction.