- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°51'17"N 5°20'37"W
- Eastings/Northings: 169839, 222671
- OS Grid: SM698226
- Mapcode Local: GBR C2.T978
- Mapcode Global: VH0TK.BMDT
Location and coordinates are for the approximate centre of Trwynmynachdy within this administrative area.
Geographic features and populated places may cross administrative borders.