The water at the edges is designed to work like a castle moat.
We'd put alligators in there but they tend to die in 100-deg. F. brine (but, man are they tasty when you cook 'em..). -Keeps the scared tourists from fooling around on 'our' sacred playground.
The Middle of the salt flats are several inches higher in elevation than the afore-mentioned, protective 'moat'.
It is lovely, and growing longer, wider, and saltier with each passing, wonderfully-hellish-hot-day we are having here in Utah right now.