Interesting Tidbit

From the Wikipedia entry on "river" (don't ask why I was looking at it, I don't remember, i think I was following links and landed onto that page), comes this trivia:

It has been noted that on average, the air distance (euclidean distance) from the beginning to the end of most rivers is about one third their actual length. For rivers that flow in plain areas, this number is very close to Pi.

I think that's so absolutely COOL.