Ubari lakes Water in the desert Deserts can be unbearably hot during the day and severely cold at night, sometimes even the snow whitens the sand. When we think of deserts, we are reminded of camel caravans, mirages and film performances of imminent deaths due to thirst. Endless sand dunes give the feeling of a terrible lack of water, but nevertheless, the water is present. If not elsewhere, below the surface. Mostly it needs to be dug or drilled deep to reach it, but sometimes it comes to the surface on its o wn. Oases with palm trees and other vegetation