The Dead Sea is very handy for such an idea. I’ve been in it and believe me you don’t want to have a nick or cut on you if you wish to float around. One learns the true meaning of rubbing salt into a wound there. Lowest point on earth too. :)
RE: The Dead Sea is the lowest point on earth.
I forgot that. Used to think it was the Dem. National convention or the Chinese Communist Party gatherings.