Thanks Neon, I didn't know the word for that. I think Waldronate mentioned it a long time ago too. I did say that there was three things that can occur for a lake and that was number 3. You can get it with a river too just running into nothing across savannas when the rainy season comes and goes. In either case these are rare tho.

When lakes evaporate only then all the impurities in the water concentrate so the dead sea is salty. That's also occurring in many places in the world where they irrigate crops since all the water is taken up by plants and evaporated leaving progressively salty and infertile soil. Theres some beatiful round shapes in the desert like this which is circular irrigation zones.

http://maps.google.co.uk/maps?hl=en&...37708&t=h&z=11

Oh and I think I had just better say that lakes are in fact extremely numerous and all over the place contrary to what I said before. Perhaps I just live in a land that does not have all that many...