A 2015 astronaut photo shows dark-orange water that appears to bleed across the bright-white floor of a high-altitude salt lake in the Bolivian Andes.

The Euphrates River fueled the "cradle of civilization," and a new study reveals the waterway was born of two other ancient rivers around 3.6 million years ago.

Iran is experiencing "water bankruptcy" that stems from decades of broken water governance and aggressive policies, and the current war is exacerbating the crisis.

Fingal's Cave is a hollow inside the Scottish island of Staffa that is characterized by massive, interlocking hexagonal columns of volcanic rock and astonishing acoustics.

Fires from March 7 airstrikes created a sulfur dioxide plume spanning 185,000 square miles.

Researchers have warned that the Thwaites Glacier, one of the largest glaciers in the world, is about to lose its eastern ice shelf. We spoke to marine geophysicist Robert Larter about what this means for the "Doomsday Glacier."

West Antarctica's "Doomsday Glacier" is on the brink of losing its ice shelf, further compromising the already melting ice mass and threatening to unleash devastating sea-level rises.

A 2015 satellite photo shows a series of golden tendrils surrounding Ghana's Lake Bosumtwi, which is considered sacred to the local Asante people. The lake and its surroundings were shaped by a massive meteor impact around 1 million years ago.

A 2015 astronaut photo shows dark-orange water that appears to bleed across the bright-white floor of a high-altitude salt lake in the Bolivian Andes.

A 2015 astronaut photo shows dark-orange water that appears to bleed across the bright-white floor of a high-altitude salt lake in the Bolivian Andes.