Southern Malayalam, with a steady Tamil gradient running down the coast, and one district in the middle that ended up defining how the whole language is written. The Church Missionary Society press at Kottayam cast the first Malayalam movable type in 1821 and published Benjamin Bailey's dictionary in 1846, so the central Travancore register is disproportionately what print, school and broadcast Malayalam sound like. What the region speaks and what it prints are therefore closer here than almost anywhere else in the language.
Thekkan (southern) MalayalamDravidian — Malayalam
Distinct intonation, a set of verb endings not used further north, and a steadily higher proportion of Tamil lexicon towards the southern end of the coast. Widely used in film comedy, which has given it an unearned reputation as a rustic register.
Speakers: Thiruvananthapuram and southern Kollam
Central Travancore MalayalamDravidian — Malayalam
The register standardised by the Kottayam presses and the mission schools. Its Syrian Christian speakers carry a distinct layer of liturgical and kinship vocabulary from Syriac.
Speakers: Kottayam, Changanassery, Alappuzha, Pathanamthitta
Kuttanad occupational speechDravidian — Malayalam
A large technical vocabulary for water, bunds, pumping, field blocks and boat parts that has no equivalent elsewhere in the language, because no other Malayalam-speaking community farms below the sea.
Speakers: Farming and boating communities of the polders
Travancore agraharam TamilDravidian — Tamil
Tamil-speaking households settled around the Travancore court and its temples, retaining Tamil at home and in ritual while working entirely in Malayalam outside it. The agraharam streets of the capital are the visible form of this.
Speakers: Tamil Brahmin settlements around Thiruvananthapuram and the temple towns