With more than 1,200 square miles of land area, U.S. Army Yuma Proving Ground (YPG) is the fourth-largest installation in the ...

This lake in Arizona's mountains is a haven for outdoor adventurers, with incredible fishing, boating, and hiking ...

Native wildlife harmed by the habitat damage include mule deer, desert bighorn sheep and quail. The agency’s horse management plan is being challenged by the Center for Biological Diversity, Maricopa ...