(A). A sandy desert. The camel is the ship of the desert. We read of the Persian sea of sand.
“The see that men slepen the gravely see, that is alle gravelle and sond with outen only drope of watre.” —Mandeville:Travels.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Dry Sea from Fact Monster: