vernal pool in the ein akev stream in the zin valley in israel

akev arid back backroads beaten blue boker boqer campground chalk clouds desert earth ecosystem ein environment facing formation geological geology hatsinim highlands hiking israel jeep landscape layers less metsukei mountain mountains nahal nature near negev off phenomenon pond pool reserve road rock sand scattered science scum sde seasonal sky south spring strata stream temporary touring track travel traveled vernal water wilderness zin