Sønderjysk
Also are various influences of neighbouring languages on the dialects. On Sylt, Föhr and Amrum and in parts of the northern mainland, there is a strong Danish (South Jutlandic) influence, but on Heligoland and the rest of mainland North Frisia, the Low German influence is predominant. Moreover, there has historically been little exchange between the dialects and so hardly any lingua franca could develop and there was no cultural centre in North Frisia for which the dialect could have had a leading role.