The Illinois Confederation, also referred to as the Illiniwek or Illini, were a loosely organized group of 12 or 13 tribes who lived in the Mississippi River Valley. Eventually, member tribes occupied an area reaching from Lake Michigan to Iowa, Illinois, Missouri, and Arkansas. The five main tribes were the Cahokia, Kaskaskia, Mitchigamea, Peoria, and Tamaroa. Other related tribes included the Maroa, Tapourao, Coiracoentanon, Espeminka, Moingwena, Chinkoa, and Chepoussa. By 1700, only the Cahokia, Kaskaskia, Michigamea, Peoria, and Tamaroa remained.