Arizona groundwater is a lifeline that sustains cities, tribal communities, farms, and plants and animals. Learn the basics.

A meteorite that struck near Winslow, Arizona, about 56,000 years ago may have triggered a massive landslide in the Grand ...

A wildfire that tore through a historic Grand Canyon lodge and raged out of control Monday had been allowed to burn for days ...

Cutting‑edge dating reveals driftwood high in Grand Canyon caves 55,250 years ago when a meteor’s shock wave blocked and ...

In this secluded paradise, mail still arrives by mule, turquoise cascades tumble into travertine pools, and time flows at the ...

A new study has revealed the formation of the Grand Canyon may be tied to the creation of another Arizona landmark.

A lightning-caused wildfire known as the Dragon Bravo Fire is burning on the North Rim of Grand Canyon National Park. The fire is currently estimated at approximately 10 acres and is located south of ...

A new emergency system for the Grand Canyon is getting life-saving messages to people with little cellphone service.

I visited the Grand Canyon's North Rim looking for a uniquely Arizona experience. Instead, it taught me what it meant to be an Arizonan.

The latest on the Dragon Bravo and White Sage fires. Plus, the trails, lodges, and campgrounds that are closed to visitors.

Emerald Cave, also known as Emerald Cove, shimmers with luminous green light. Here's the best time to visit Emerald Cave and how to get there.