The Green River in the southwest also contains a number of islands. The state of Wyoming has 23 counties. Wyoming license plates have a number on the left that indicates the county where the vehicle is registered, ranked by an earlier census. Specifically, the numbers are representative of the property values of the counties in 1930. The county license plate numbers are:  The State of Wyoming has 99 incorporated municipalities. In 2005, 50.6% of Wyomingites lived in one of the 13 most populous Wyoming municipalities. The United States Census Bureau has defined two Metropolitan Statistical Areas (MSA) and seven Micropolitan Statistical Areas (MiSA) for the State of Wyoming. In 2008, 30.4% of Wyomingites lived in either of the Metropolitan Statistical Areas, and 73% lived in either a Metropolitan Statistical Area or a Micropolitan Statistical Area. The Wind River Indian Reservation is shared by the Eastern Shoshone and Northern Arapaho tribes of Native Americans in the central western portion of the state near Lander. The reservation is home to 2,500 Eastern Shoshone and 5,000 Northern Arapaho. Chief Washakie established the reservation in 1868 as the result of negotiations with the federal government in the Fort Bridger Treaty. However, the Northern Arapaho were forced onto the Shoshone reservation in 1876 by the federal government after the government failed to provide a promised separate reservation. Today the Wind River Indian Reservation is jointly owned, with each tribe having a 50% interest in the land, water, and other natural resources. The reservation is a sovereign, self-governed land with two independent governing bodies: the Eastern Shoshone Tribe and the Northern Arapaho Tribe. Until 2014, the Shoshone Business Council and Northern Arapaho Business Council met jointly as the Joint Business Council to decide matters that affect both tribes. Six elected council members from each tribe served on the joint council. Nearly half the land in Wyoming (about ) is owned by the federal government; the state owns another . Most of it is administered by the Bureau of Land Management and U.S. Forest Service in numerous national forests and a national grassland, not to mention vast swaths of "public" land and an air force base near Cheyenne. There are also areas managed by the National Park Service and agencies such as the U.S. Fish and Wildlife Service. Several Native American groups originally inhabited the region now known as Wyoming. The Crow, Arapaho, Lakota, and Shoshone were but a few of the original inhabitants white explorers encountered when they first visited the region.