A language-family boundary runs through the middle of one district, and it is the single most important fact about this region. Below the Sutlej gorge the speech is Western Pahari — Indo-Aryan, related to the dialects of Shimla and Mandi. Above it, Kinnauri is Tibeto-Burman, of the West Himalayish group, with its own numeral system, its own verb morphology and almost no Indo-Aryan core vocabulary. Above Sumdo the language changes again, to Bhoti, which is a Tibetic language written in the Tibetan script. So a traveller going a hundred and fifty kilometres up one river valley crosses two family boundaries, and the people on either side of each boundary have intermarried, traded and shared festivals for centuries. Kinnauri is written in Devanagari when it is written at all, which is not often. Bhoti has a literate monastic tradition older than most of the region's buildings, which means the higher and poorer valley is the one with the deeper written culture — the reverse of the usual expectation.
Kinnauri (Lower, Sangla–Kalpa)Sino-Tibetan, West Himalayish
The prestige variety, spoken around Kalpa, Sangla and Reckong Peo, and the one meant when a speaker says "Kinnauri" without qualification. Heavily loaded with Hindi vocabulary through school, radio and the apple trade.
बोलने वाले: Roughly 80,000 returned as Kinnauri in the 2011 Census, across all varieties
Chitkuli KinnauriSino-Tibetan, West Himalayish
Spoken in Chitkul and Rakcham at the head of the Baspa valley, and distinct enough from the Kalpa variety that speakers do not simply understand one another. Two villages, one language, and a very small number of speakers.
Upper Kinnauri (Sunam, Jangram, Shumcho, Thebor)Sino-Tibetan, West Himalayish
A cluster of closely related but separately named varieties through the Pooh, Kanam and Ropa areas, each village group holding to its own. They shade towards Tibetic in vocabulary the further up the valley they sit.
Spiti BhotiSino-Tibetan, Tibetic
A Tibetic language written in the Tibetan script and closely related to the speech of Ladakh and western Tibet. Local usage often simply calls it Bhoti; the classical written register is the language of the monastery, and the spoken one has diverged from it as much as any spoken language does from its liturgical form.
Western Pahari of the lower SutlejIndo-Aryan, Northern zone
The Mahasu and Bushahri speech of the Rampur and Nichar side, Indo-Aryan and continuous with the dialects of Shimla district. It reaches up the gorge and stops; the change is not gradual so much as village by village.