[5] Southern Valencian is renowned by the presence of different types of vowel harmony.
It includes all the comarques south of the Xúquer river that do not devoice the sibilants up to the line that joins the west to east the town of Biar with Busot.
This dialectal zone is, broadly speaking, what we know as "General Valencian", in other words, the set of not Northern Valencian speeches that do not devoice the sibilants and do not participate of the linguistic singularity of the Lower Southern dialect.
To avoid confusion between the different dialectal realities of the comarques of this provincial demarcation, it is best using the term Southern or Lower Southern to describe the speeches that extend to the south of the line that links the settlements of Biar and Busot, that includes the south of l'Alcoià, l'Alacantí and the valleys of the river Vinalopó.
[5] In the previously mentioned zone there are a series of features that singularise this dialectal set:[8] The region of the Valls del Vinalopó and neighbouring areas form a dialectal zone within the Lower Southern dialect with the following features:[8] In morphology the Lower Southern dialect has the following features:[9]