Where Does the Water Come From in an Oasis?

An oasis is a green, fertile area surrounded by desert. Some oases are supplied with water by underground springs.

Others receive their water from streams that bring rainwater down from nearby mountains.

An oasis usually has palm trees and tropical fruits and vegetables. Some small oases are used as resting points for travelers crossing the desert. Others are large enough to house an entire town, or even a small city.