A geyser is a vent that erupts water and steam. There are also underground lakes and aquifers.
ground water
A body of water stored in an underground space is an aquifer.
An aquifer is an underground accumulation of water.
sewerage
ground water
the water table
A body of water stored in an underground space is an aquifer.
groundwater
A body of water stored in an underground space is an aquifer.
No. They go to a body of salt water.
Aquifer is the general name, and the body of water could be free or confined.
they call it that because it was underground and its was a rail road
Underground water is called underground water, because it is "underground" not because it is fresh or salt. You can have underground salt water reservoirs just like you can have fresh water ones.