The Kalto Alphabet

Kalto (ISO 639-3: nlx), also known as Nihali or Nahali, is an endangered language spoken by a small community in Nimar district, Madhya Pradesh, India, near the Maharashtra border. The speakers live in villages along the Tapti (Tapi) river plains — a region of contact between Madhya Pradesh, Maharashtra, and communities speaking Marathi, Hindi, and Korku.

Estimates of Kalto speakers vary widely in the literature, with figures from a few hundred to a few thousand, reflecting both the small community size and the difficulty of conducting linguistic censuses for marginally documented languages. Most speakers are bilingual or multilingual in Marathi and/or Hindi.

A language isolate is a language with no demonstrable genealogical relationship to any other known language family. Famous examples include Basque in Europe and Burushaski in Pakistan. Kalto (Nihali/Nahali) is considered a language isolate or near-isolate of South Asia — meaning it does not clearly belong to the Indo-Aryan, Dravidian, Austroasiatic, or Tibeto-Burman language families that dominate the Indian subcontinent.

Some linguists have proposed that Kalto may preserve traces of an ancient pre-Indo-Aryan substrate, possibly with distant Austroasiatic/Munda connections — but these proposals remain debated and unproven. The language's isolation makes it linguistically invaluable for understanding the deep prehistoric linguistic landscape of central India.

Kalto is written in Devanagari script (Unicode Block U+0900–U+097F) — the same script used for Standard Hindi, Marathi, Nepali, and Sanskrit. Devanagari is a Brahmic abugida, written left to right, in which each consonant letter carries an inherent /a/ vowel that is modified or suppressed by diacritical marks called matras.

The Devanagari alphabet for Kalto includes 33 consonants, 11 independent vowels, a set of vowel diacritics (matras), and native Devanagari digits (०–९). Since Kalto uses the same script as Standard Hindi and Marathi, written Kalto is visually similar to both — although the spoken language is entirely distinct in vocabulary and grammar as a potential language isolate.

Kalto, Nahali, and Nihali are three names for the same language or very closely related speech, sharing the ISO 639-3 code nlx. This is similar to the relationship between Gawar-Bati and Narsati on this site — two names for the same Dardic language.

In linguistic literature, "Nihali" tends to be the name preferred by typologists and language documentation researchers. "Kalto" is used by some community members and in certain local administrative contexts. "Nahali" reflects yet another regional or scholarly naming convention. All three names refer to the same endangered language isolate of Nimar district, Madhya Pradesh.

Kalto is a language isolate — it does not belong to any established language family. Surrounding languages belong to the Indo-Aryan family (Hindi, Marathi, Bhili) and the Dravidian family (various languages to the south), but Kalto shows no systematic genealogical affinity to either group.

Some historical-linguistic research has proposed connections to Austroasiatic (Munda) languages of central India, noting certain lexical similarities. However, these proposals have not been accepted as demonstrating genealogical kinship. Kalto's status as an isolate means it may preserve features from a prehistoric language stratum of central India predating the arrival of Indo-Aryan-speaking populations.

Yes. Kalto is classified as endangered by the Endangered Languages Project. The speaker community in Nimar district, Madhya Pradesh is small and surrounded by Hindi and Marathi speakers. The language lacks formal educational support, a standardised orthography, or a significant literary tradition.

Most Kalto speakers are bilingual or multilingual in Marathi and/or Hindi, and younger generations tend to shift toward these dominant regional languages for everyday communication. Ongoing linguistic documentation efforts are important for preserving the language's unique vocabulary, which — as a potential isolate — cannot be reconstructed from any related language if lost.