Aceh is a province in Indonesia (if you remember Tsunami disaster in the year of 2004, it's the most devastating area hit by Tsunami).
Steemit user from Indonesia originated from this region and later it's spread to the rest of the country.
Statistically, it is a bit surprising since the #Aceh is able to compete amongst other much wider regions in the Steemit trending tags.
By the way, I've found another advantage of #kr tag. Its content control related to the tag is the best. The scary krguidedog bot can be operated any korean user just by typing that magic word it is quite effective to dispel the tag abuser.