lone umbrella thorn acacia high above wadi nahal nekarot stream bed in israel

acacia adaptation arava area arid arroyo art background beaten blue cliff clifftop cloud copy desert desertscape details dry ecology ecosystem ecotourism environment extreme fine flash flood geology geomorphology habitat incense israel landscape levels mountain nahal nature negev nekarot nobody off one outdoor path photo photography road route scenic sky small space sparse spice survival the thorn tortilis tour touring tourism travel tree umbrella vegetation wadi wash wilderness