This is a seam, not a block. Kannada is the language of the region and of its administration, but the coast holds a Konkani-speaking population that arrived by sea and by migration from the north, the ghat uplands hold an archaic Kannada spoken almost exclusively by one cultivating community, and Bhatkal at the southern end holds a language spoken almost nowhere else. Almost nobody here is monolingual, and the working assumption in a market town is that the person across the counter speaks a different first language.
Havyaka KannadaDravidian, Southern
A conservative variety retaining verb and pronoun forms that standard Kannada has lost, spoken by the Brahmin community that cultivates areca and pepper above the ghat. It has its own literature, its own broadcast presence and a strong sense of itself as older rather than deviant.
Speakers: The Havyaka community across the areca uplands, and into Shivamogga and Dakshina Kannada
Coastal KannadaDravidian, Southern
The Kumta, Honnavar and Bhatkal register, shading southward towards Kundapura Kannada and the Tulu country. It carries a substantial Konkani and Marathi loan vocabulary, especially for fish, boats and trade.
Halakki KannadaDravidian, Southern
The variety of the Halakki Vokkaliga community of the coastal plain, distinct enough in vocabulary and intonation to be identifiable immediately, and carrying an oral song repertoire that has been documented far better than the speech itself.
Karwari KonkaniIndo-Aryan, Southern
Spoken by Saraswat, Kharvi, Christian and other communities of the northern coast, continuous with the Konkani of Goa immediately north and written here in Devanagari or Kannada script depending on the community.
NawayathiIndo-Aryan, with heavy Persian and Arabic lexicon
A Konkani-based language carrying a large Persian, Arabic and Urdu vocabulary, spoken by a merchant community whose settlement on this coast is traced to Arab trade contact. It is chiefly a spoken language, is not used in schooling, and is sustained by a community that has emigrated widely for work and continues to use it abroad.
Speakers: The Nawayath community of Bhatkal and its diaspora
Marathi and Konkani of the Joida forestIndo-Aryan, Southern
The northern and eastern forest taluks shade into Marathi and into the Konkani of the Goan hinterland, and village names there read Marathi long before the administrative boundary suggests they should.