Greece is more than sun and sea. It’s a canyoning paradise waiting to be explored, from the gorges of Crete to the ravines of Epirus ...

The 120-mile Tijuana River flows from Baja California into the United States and discharges millions of gallons of wastewater ...

Hells Canyon is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed.

As the Colorado River’s reservoirs have declined, even larger amounts of groundwater have been drained from aquifers. Using ...

Scientists have uncovered the world’s largest underground river deep within Colombia, marking one of the most priceless natural discoveries in recent history. This vast subterranean waterway stretches ...

This river is 2,250 kilometers long and is also known as the Black River because of its dark color. Leaves, twigs, and other ...