Spring (water)
A spring is a place where an underground stream flows out of the ground. By analogy, a fountain can also be called a spring. As it flows underground, a stream picks up minerals from rocks, and so water flowing from a spring is often bottled and sold as mineral water.
A spring may be the source of a river.
See also
de:Quelle (Gewässer) ja:湧水 ro:izvor