The great late Douglas Adams states the following here :
http://www.douglasadams.com/dna/980707-02-a.html
I have seen this stated in a couple not-so-true trivia lists on the internet but have not found a single piece of evidence to back it up.
My history teacher says there is a kink in it because of a large lake.
Is this true, and can I back it up easily with a credible source?