- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 50°39'59"N 4°37'23"W
- Eastings/Northings: 214725, 88475
- OS Grid: SX147884
- Mapcode Local: GBR N7.769P
- Mapcode Global: FRA 1769.W5R
Location and coordinates are for the approximate centre of Trewannion Down within this administrative area.
Geographic features and populated places may cross administrative borders.