Also present in most of the interior of Mexico is the preservation (absence of debuccalization) of syllable-final ; this, combined with frequent unstressed vowel reduction, gives the sibilant a special prominence. This situation contrasts with that in the coastal areas, on both the Pacific and the Gulf Coastal sides, where the weakening or debuccalization of syllable-final is a sociolinguistic marker, reflecting the tension between the Mexico City norm and the historical tendency towards consonantal weakening characteristic of coastal areas in Spanish America. Dialects of both the Pacific and the Gulf Coast have received more influences from Andalusian and Canarian Spanish dialects.