- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 50°39'5"N 4°37'24"W
- Eastings/Northings: 214637, 86826
- OS Grid: SX146868
- Mapcode Local: GBR N7.8660
- Mapcode Global: FRA 176C.2KT
Location and coordinates are for the approximate centre of Trewassa within this administrative area.
Geographic features and populated places may cross administrative borders.