Revelation 17:9

9 “This calls for a mind with wisdom. The seven heads are seven hills on which the woman sits.

Read Revelation 17:9 Using Other Translations

And here is the mind which hath wisdom. The seven heads are seven mountains, on which the woman sitteth.
This calls for a mind with wisdom: the seven heads are seven mountains on which the woman is seated;
“This calls for a mind with understanding: The seven heads of the beast represent the seven hills where the woman rules. They also represent seven kings.