This one looks tricky. Looks like on a larger level there are only three administrative regions, but then there are 58 provinces + 5 municipalities.
Could divide it by the eight sub-regions
Northern Vietnam includes the following subregions:
Central Vietnam includes the following subregions:
Southern Vietnam includes the following subregions:
- Central Highlands (Tây Nguyên - meaning western whole)
- Southeast (Đông Nam Bộ)
- Mekong River Delta (Đồng Bằng Sông Cửu Long)
Seems like a good option
Ok so this list is the going one?
Red River Delta
North Central Coast
South Central Coast
Mekong River Delta