Specifically, it is spoken on the following islands within Romblon:
Tablas: the municipalities of Odiongan and Calatrava, situated respectively on the western and northern parts of the island. The Odiongan dialect has more outside influences and is more widely used in literature.
Banton: the island's sole municipality of Banton. This is the prestige dialect of Bantuanon and is considered by many native speakers to be the most representative dialect of the language.
Linguist David Zorc notes that Asi speakers may have been the first Visayan speakers in the Romblon region. He also suggests that Asi may have a Cebuan substratum and that many of its words may have been influenced by the later influx of other languages such as Romblomanon.
Asi has sixteen consonants: p, t, k, b, d, g, m, n, ng, s, h, w, l, r and y. There are four vowels: a, i/e, and u/o. The vowels i and e are allophones, with i always being used when it is the beginning and sometimes end of a syllable, and e always used when it ends a syllable.The vowels u and o are allophones, with u always being used when it is the beginning and sometimes end of a syllable, and o always used when it ends a syllable. This is one of the Philippine languages which is excluded from [ɾ]-[d] allophone.
^Zorc, David Paul. The Bisayan Dialects of the Philippines: Subgrouping and Reconstruction. Canberra, Australia: Dept. of Linguistics, Research School of Pacific Studies, Australian National University, 1977.