1. Civilisation
The first story I was told about rivers can be summed up like this: there is direct line from the Sumerian Ziggurat of Ur to the Chrysler Building. I was around nine.
2. Civilisation II
Rivers allowed us to grow food, store it, build houses, libraries, museums, cities and empires. I was maybe ten when I heard this one.
You can read the rest of this piece on the Dark Mountain site here.