I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

A map.

Did You Know?

The riddle plays on the fact that maps contain representations of geographical features — cities, mountains, and bodies of water — without containing the actual physical things themselves! The oldest known map is the Babylonian Map of the World, carved into clay around 600 BCE. Modern digital maps like Google Maps process over 1 billion kilometers of driving data daily to keep directions accurate.