An oasis is a place in a desert that has water supplied by a spring or other underground water source. The word oasis can also be used in a metaphorical way to describe a refuge or relief from something difficult or unpleasant.
Looking for an oasis? Here are examples of physical desert oases throughout the world:
Here are examples of oases in Egypt:
The city of Siwa has an oasis and many small oases are close by:
Here are examples of an oasis used metaphorically:
There are many different oases, some are physical and others are metaphorical. Now, you've seen examples of both types.