Four Corners
Six governments have jurisdictional boundaries at the Four Corners Monument: the states of Arizona, Colorado, New Mexico, and Utah, as well as the tribal governments of the Navajo Nation and Ute Mountain Ute Tribe. The Four Corners Monument itself is administered by the Navajo Nation Department of Parks and Recreation. Other tribal nations within the Four Corners region include the Hopi and other Ute. The Four Corners is home to the capital of the Navajo tribal government at Window Rock, Arizona. The Ute Mountain Ute Tribal headquarters are located at Towaoc, Colorado.
Fourth Coast
The Fourth Coast is a reference to the Great Lakes region, with a particular reference to Michigan, since it has "four" coastlines, and is the only state that does. A few local businesses in Kalamazoo have adopted the name (such as the "Fourth Coast Cafe"). It seems that the term is gaining in popularity and is mentioned often in blogs when referring to Michigan.