Datapoint Gullah/Geographic variation: phonology
There clearly is phonological variation: for example, robust vowel insertion in English-derived sC clusters is reported for Wadmalaw Island, South Carolina (Jones-Jackson 1978), but not elsewhere. Native speakers have reported that they can tell from the ‘accent’ which island a given speaker is from, but further investigations on the question of areal variation in phonology are lacking.
Values 
Limited
- Confidence:
- Certain