The Mendenhall Valley (historically Mendenhall, colloquially The Valley) is the drainage area of the Mendenhall River in the U.S. state of Alaska. The valley contains a series of neighborhoods, comprising the largest populated place within the corporate limits of the City and Borough of Juneau, Alaska's capital. The valley was formed by Mendenhall Glacier over the course of roughly three thousand years. It was named for physicist and meteorologist Thomas Corwin Mendenhall.