Siouan languages
Siouan languages can be grouped into the Western Siouan languages and Catawban languages. The Western Siouan languages can be divided into Missouri River languages (such as Crow and Hidatsa), Mandan, Mississippi River languages (such as Dakotan, Chiwere-Winnebago, and Dhegihan languages), and Ohio Valley Siouan branches. The Catawban languages consist only of Catawban and Woccon.
Simeulue Regency
The people of Simeulue are similar to the people in the neighboring Nias Island, speaking 3 languages (Devayan, Sigulai and Lekon) which are distinctly different from the languages spoken in mainland Aceh. The majority of the people of Simeulue are Muslim.