&bu1=Jibal Al Qahar, Saudi Arabia. (photo: A. Kallioras/TU Darmstadt)&
&bu2=Tuwaiq Escarpment. (photo: M. Keller, GeoZentrum Nordbayern)&
&bu3=Water in the desert. (photo: GTZ-IS, Ryadh)&
&bu4=Center pivot irrigation (photo: GTZ-IS, Ryadh)&
&bu5=Sabkha/ shallow brine lake. (photo: GTZ-IS, Ryadh)&