the second largest tribal group is the navajo, who call themselves diné and live on a 16-million acre (65,000 km²) indian reservation covering northeast arizona, northwest new mexico, and southeast utah. it is home to half of the 450,000 navajo nation members. the third largest group are the lakota (sioux) nation, with distinct federally recognized tribes located in the states of minnesota, nebraska, montana, wyoming; and north and south dakota.