Vidarbha's Marathi is the variety that standard Marathi teaching most enjoys correcting, which is a reliable sign that it is doing something systematic. Varhadi replaces the standard dative forms mala and tula with male and tule, uses kahun where the standard uses ka for why, and builds its present continuous with a participle plus the verb to remain — karun rahylo, literally having done I remain, for I am doing. That last construction is the single most recognisable Vidarbha marker in the language, and it is a stable grammatical feature rather than an error. East of the Wainganga, Zadi Boli sits on top of centuries of contact with Halbi, Chhattisgarhi and Gondi and has its own literature and its own theatre. Nagpur, having been a Central Provinces capital, speaks more Hindi in public than any other Marathi city.
VarhadiIndo-Aryan, Southern
The speech of Buldhana, Akola, Washim, Amravati and Yavatmal, and loosely of the whole cotton plain. Marked by male and tule, kahun, bhakar for bhakri, and the participle-plus-remain progressive.
Speakers: Returned as Marathi in the census, so no separate count exists
Zadi BoliIndo-Aryan, Southern
Bhandara, Gondia, Chandrapur and Gadchiroli — the forest and tank country. Heavily influenced by Halbi and Chhattisgarhi, with its own writers' association and the Zadipatti theatre repertoire written in it. Speakers generally treat it as Marathi and outsiders generally cannot follow it.
Nagpuri registerIndo-Aryan, Southern
Urban Marathi with a much heavier Hindi load than any other Marathi city carries, a legacy of Nagpur's century as the capital of a Hindi-majority province. Code-switching between the two mid-sentence is unremarkable here.
Gondi and MadiaDravidian, South-Central
A Dravidian language spoken in a Marathi state, and in Gadchiroli the first language of whole blocks. Madia is its local variety. Gondi has no single accepted script and the standardisation question is live.
Speakers: Around a million and a half returned across central India, with a large share in this region
HalbiIndo-Aryan, with heavy Dravidian contact
A contact language of the Marathi–Chhattisgarhi–Gondi meeting ground, spoken in the far east and continuing into Bastar. It works as a trade tongue between speakers of unrelated languages.
KolamiDravidian
Spoken by Kolam communities in Yavatmal and across into the Telangana border districts, and unrelated to the Marathi around it. Small and under pressure.