The Navajo people (Navajo: Diné or Naabeehó) are a tribe of Native Americans from the southwestern part of the United States. The Navajo tribe has about 300,000 members. The capital is in Window Rock, Arizona. It is the second largest tribe in the United States. The Navajo Nation is an independent government that runs a large Native American reservation in parts of Arizona, New Mexico and Utah. Many Navajo live there, but not all of them. Most Navajo speak English. Some speak the Navajo language. The Navajo have many things in common with the Apache tribe and the two groups may share a common ancestry.