The main regional variants and sub-variants of Venetian are
Central (Padua, Vicenza, Polesine), with about 1,500,000 speakers.
Eastern/Coastal (Venice, Trieste, Grado, Istria, Fiume).
Western (Verona, Trento).
North-Central (Treviso, most of Pordenonese).
Northern (Belluno, comprising Feltre, Agordo, Cadore, Zoldo Alto).
All these variants are mutually intelligible, with a minimum 92% between the most diverging ones (Central and Western). Modern speakers reportedly can still understand to some extent Venetian texts from the 14th century.
Other noteworthy variants are spoken in
Chioggia,
Pontine Marshes,
Dalmatia, Croatia,
Rio Grande do Sul (Antônio Prado), Santa Catarina, Paraná e São Paulo, Brazil ("Talian"),
Chipilo, Mexico,
Peripheral creole languages along the southern border (nearly extinct).