Not every desert in the Arabian Peninsula is sand.
In the mid 1980s I lived on the Red Sea coast of Saudi Arabia, in the Western Region. The area is known historically as the Hejaz after the mountains running north from Jeddah, parallel to the Red Sea coast. This is the region of Mecca and Medina. And the Hejaz mountains divide the Tihama, the coastal plain influenced by the Red Sea from the inland deserts, Nafud, and Nejd.
The first time I heard the phrase in the above image caption, ‘no water–no life’ was in Morocco in the early 1970s. I was sitting with a group of people including a young Moroccan man, from Meknes, whose family originally had been farmers in Taza. He said, “Without water there is no life and no cleanliness.”