Everything spoken across the belt except in the topmost villages belongs to the Tani branch of Tibeto-Burman — Adi, Galo, Tagin, Nyishi, Apatani and Mising are all Tani, and they are close enough that a speaker of one can pick up the shape of another within days. That is the region's most useful single fact, because it makes the hill-and-floodplain division an administrative one rather than a linguistic one: the Mising of the Assam sandbars are Tani speakers who moved downhill. None of these languages had a script before the twentieth century, and the ritual registers used in abang chanting are archaic enough that ordinary speakers need them explained.
AdiSino-Tibetan, Tibeto-Burman, Tani
A cluster rather than a single language — Padam, Minyong, Pasi, Panggi, Komkar, Shimong, Ashing, Bori, Bokar, Pailibo, Ramo and Tangam among others, with mutual intelligibility falling off sharply between the downstream and the gorge varieties. Padam and Minyong carry most of the published material.
बोलने वाले: Around 250,000 returned as Adi speakers in the 2011 Census
GaloSino-Tibetan, Tibeto-Burman, Tani
Written Gallong in older records, and long treated administratively as an Adi variety; it is now recognised and documented as a language in its own right, with its own literature body and its own geographical indication for its weaving.
TaginSino-Tibetan, Tibeto-Burman, Tani
The Subansiri basin around Daporijo, transitional westward towards Nyishi. Si-Donyi, in January, is the Tagin festival.
ApataniSino-Tibetan, Tibeto-Burman, Tani
Confined almost entirely to the Ziro valley floor — a small, tonally distinctive Tani language spoken by a community with a settled agricultural system quite unlike its neighbours'.
MilangSino-Tibetan, Tibeto-Burman, Tani
Spoken in three villages on the eastern flank of the Siang and divergent enough from Adi that linguists treat it separately. One of the most endangered languages in the belt.
बोलने वाले: A few thousand, in a handful of villages
Memba and KhambaSino-Tibetan, Tibetic
Not Tani at all. Spoken at the head of the valley around Tuting and in Mechuka, by Buddhist communities whose institutional life runs through monasteries. The change of language, food, dress and religion happens within about a day's travel up the gorge.
MisingSino-Tibetan, Tibeto-Burman, Tani
Listed here because it is the same branch spoken downstream. Mising has more speakers than any hill Tani language, an active written movement, and a festival calendar recognisably related to Solung and Mopin.
बोलने वाले: Around 630,000 returned in the 2011 Census, almost all in Assam