Researchers have filmed goblin sharks in the deep sea for the first time. Until now, these sharks had been seen alive only after being hauled up to the surface with fishing lines.

A mysterious geological structure that resembles a human hand with outstretched fingers has been revealed beneath East Antarctica. The discovery shows the frozen continent still hides many geological secrets.

Researchers say the Arctic Ocean crossed a biological tipping point in 2009, when nitrate levels in the water suddenly started dropping due to a drastic reduction in sea ice extent.

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.