Note: Do not rely on this information. It is very old.
Oasis, a fertile spot in the midst of a desert, caused by the presence of a well or spring. The word is derived from the ancient Egyptian language, and was at first used only of such spots in the Libyan Desert. In Algeria the French have formed artificial oases by sinking artesian wells. By employing irrigation, barley, rice, and other cereals can be cultivated.