It is called a watershed!
The 'catchment'.
It is called the river styx
River poddle
river luni
There is no river under the tower. But the Seine flows NW of it, about 200 mtrs away, between the tower and the Palais de Chaillot under the Pont D'Iéna.
St. Johns River flows under the Buckman Bridge.
The Nille River flows uphill
Hudson River
River Sherburne is a river located in England that flows under the center of the city of Coventry. There is no known research on how deep this river is.
artesian
This can be found by searching for images on the web under the rivers name.
The name of the river is the Mississippi River.
That is called "artesian water" .That is called "artesian water" .