underground river

Researchers from the University of Western Australia (UWA) discovered many underground rivers flowing along the continental shelf of the country.

Greenland extends the foundation for nearly 1,000 miles (1,600 km) of a valley that can hold an underground river, transporting water from Greenland to the northern part of the

Brazil's Amazon underground river is not a river in the usual sense even though its existence has been confirmed in a report published last week at Brazil's scientific conference.