That's the Bonnevile Salt Flats. One valley west of there is Pilot Valley...another salt playa... squishey-er than the Salt Flats. Spouse has done field work in PV for years. Went once or twice.... you cant even touch your face or heaven help you rub your eyes.... the dust is mostly salt..... have told kids everyone should go there once to appreciate how much nicer it is just about anyplace else on the planet than there. Spouse got bit on the eardrum by a gnat once, so that was special. Also, there are certain times of years when it's best not to go pee behind a rock because its rattlesnake season.