For the more than 1 billion people who rely on the world's mountains for their water supply, the tap may be starting to fail.

Ioana Barbu is the first person to finish the Beyond the Ultimate Global Race Series of ultramarathons in a single calendar year.

Korrin Bishop is an outdoor travel expert who once lived near Great Smoky Mountains National Park. She spent considerable time exploring the park and its many offerings. She offers tips for learning more about the nature around you on-the-go, how to get ...

For more than two decades, Polish photographer Karol Nienartowicz has been chasing light in the mountains. He began photographing in 2003, initially working with analog equipment and developing his own images in the darkroom before transitioning to digital photography a few years later.

A coalition of environmental groups filed a lawsuit Tuesday challenging federal agencies’ decision to approve an underground copper-and-silver exploration project in the Cabinet Mountains south of Libby.