- Category: Water Feature
- Type: Island
- Latitude/Longitude: 57°0'1"N 2°10'6"W
- Eastings/Northings: 389874, 789933
- OS Grid: NO898899
- Mapcode Local: GBR XM.J8CF
- Mapcode Global: WH9RG.N9NP
Location and coordinates are for the approximate centre of Tilly Daff within this administrative area.
Geographic features and populated places may cross administrative borders.