Jacob Pratt via tz said:
At least with regard to US states, internal state borders do *not* change when rivers change course.
My understanding of US law (from a consultant geologist who did this stuff for a living) is that if a river gradually moves, borders (including both properties and administrative areas) move with it. But if there's a catastrophic change - e.g. a heavy storm causes the river to burst a bank and take a new route - then the border does *NOT* move. For a European example, look at the border dispute between Croatia (who claim the cadastral boundary) and Serbia (who claim the thalweg boundary). -- Clive D.W. Feather | If you lie to the compiler, Email: clive@davros.org | it will get its revenge. Web: http://www.davros.org | - Henry Spencer Mobile: +44 7973 377646