"Northern Arapaho" is a phrase with a few different, and sometimes confusing, meanings.
1) The Northern Arapaho Tribe refers to one of the two main divisions of the Arapaho people.
Today the Northern Arapahos are located in Wyoming,
where they share the Wind River Reservation with the Eastern Shoshone.
2) Northern Arapaho was one of the major dialects of the Arapaho language, so called because it was originally
spoken by bands in the northern part of Arapaho territory. However, both the people today known as "Northern
Arapaho" and "Southern Arapaho" are speakers of the original Northern Arapaho dialect. The Southern Arapaho dialect was
spoken by the Nawathineha and related bands, and although there are Nawathineha descendants among the
Southern Arapaho tribe, the Southern dialect is no longer spoken today. So the "Northern Arapaho language" is
today the same thing as the "Arapaho language."
3) The Gros Ventre tribe was sometimes historically referred to as the "Northern Arapaho," due to their location
directly to the north of Arapaho territory and their very similar language and customs.
Here are links to our webpages about the Northern Arapaho tribe and language: