Nyishi (also known as Nishi, Nisi, Nishang, Nissi, Nyising, Leil, Aya, Akang, Bangni-Bangru, Solung) is a Sino-Tibetan language of the Tani branch spoken in Papum Pare, Lower Subansiri, Kurung Kumey, Kra Daadi, East Kameng, Pakke Kesang, Kamle districts of Arunachal Pradesh and Darrang District of Assam in India.
Though there are plenty of variations across regions, the dialects of Nishi, such as Akang, Aya, Nyishi (raga), Tagin are easily mutually intelligible, with the exception of the rather small in population Bangni-Bangru and Solung Dialects being very different from the former.
Mr. William Robinson in his notes mentioned that Daflas were spread over a region from 92°50’ to 94° north latitude.
Nishi is a tonal language that utilizes three tones: rising, neutral, and falling.
Velar fricative [x] appears in less than ten words in Abraham's vocabulary list, and is regarded as questionably phonemic.