Minor league professional hockey leagues in the U.S. include the American Hockey League and the ECHL. Additionally, nine U.S.-based teams compete in the three member leagues of the Canadian Hockey League, a "junior" league for players aged sixteen to twenty. College hockey has a regional following in the northeastern and upper midwestern United States. It is increasingly being used to develop players for the NHL and other professional leagues (the U.S. has junior leagues, the United States Hockey League and North American Hockey League, but they are more restricted to protect junior players' college eligibility). The Frozen Four is college hockey's national championship. The U.S. now has more youth hockey players than all other countries, excluding Canada, combined. USA Hockey is the official governing body for amateur hockey in the United States. The United States Hockey Hall of Fame is located in Eveleth, Minnesota.