The Littoral dialect group (primorska narečna skupina) is a group of very heterogeneous dialects of Slovene. The Littoral dialects are spoken in most of the Slovenian Littoral (except for the mountainous areas around Tolmin and Cerkno, where Rovte dialects are spoken) and in the western part of Inner Carniola. They are also spoken by Slovenes in the Italian provinces of Trieste and Gorizia, and in the mountainous areas of eastern Friuli (Venetian Slovenia and Resia).[1]
Among other features, this group is characterized by diphthongization of yat > ie and o > uo, and late denasalization of *ę and *ǫ. The western dialects in this group have preserved pitch accent whereas the others have a non-tonal stress accent.