There’s a cave in Illinois that watches the Ohio River go by. It’s big, strange, and way more memorable than expected.

New research may have solved an American mystery which has baffled geologists for a century and a half: How did a river carve ...

This makes the story of how the Green and Colorado Rivers met so perplexing to geologists like Adam Smith at Scotland’s University of Glasgow. According to the coauthor of his team’s study published ...

A canyon hike in Illinois that feels way bigger than it should. Rugged trails, dramatic rock walls, and real adventure ...

Millions of years ago, the Green River carved a path through the Uinta Mountains instead of flowing around the formation. Now ...

Go beyond the bright lights of California’s cities and you’ll find a natural wonderland ideal for a full reset, as Michelle Bates discovers.

Venture outside of Las Vegas to the state’s parks, where stunning scenery and intriguing history complement a range of outdoor adventures.

"You need so much water that we think these could be evidence of an ancient warmer and wetter climate where there was rain ...

The intimidatingly named Gates of Lodore marks the entrance to the 700-metre deep Canyon of Lodore that slices straight ...

This aligns with preexisting estimates of when the river probably carved through the Uinta Mountains—creating a canyon that today is 2,297 feet (700 meters) deep—and joined the Colorado system. In ...

Deep beneath the Earth's surface, in the pores and crevices of rock, live huge communities of microorganisms. They are invisible to the naked eye—yet they play a central role in the quality of our ...

NPCA answers frequently asked questions about the latest attempt by Cadiz Inc. to drain the Mojave Desert’s groundwater for profit.