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.
Saisiyat language
The language area of Saisiyat is small, situated in the northwest of the country between the Hakka Chinese and Atayal regions in the mountains (Wufeng, Hsinchu; Nanchuang and Shitan, Miaoli).
There are two main dialects: Ta'ai (North Saisiyat) and Tungho (South Saisiyat). Ta'ai is spoken in Miao-Li and Tungho is spoken in Hsinchu.
Kulon, an extinct Formosan language, is closely related to Saisiyat but is considered by Taiwanese linguist Paul Jen-kuei Li to be a separate language.