Ever wonder what the deepest lake in Arizona is? Here's what you want to know about the top spot for swimming, boating and more in Arizona.

The far side of the Moon has its own versions of the Grand Canyon—two of them, in fact! A new study explains how these deep ...

The Umatilla River once served as an important meeting ground for the Cayuse and their Nez Perce allies to the east. A large ...

When wildfires consume structures in urban areas, the health risks are much higher. The ash falling to the ground contains ...