Use
Oasis is an area in a desert where there is sufficient water
for plants to grow. It can vary in size, from a small plot to
a vast region covering thousands of square kilometers.
The Nile valley is a large oasis flanked by deserts. Oases
occur around springs where the porous rock comes to the
surface or where water may be tapped through wells.
Artificial oases are created in many deserts.