- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°7'52"N 4°41'47"W
- Eastings/Northings: 215541, 251531
- OS Grid: SN155515
- Mapcode Local: GBR CY.7V1W
- Mapcode Global: VH2MG.KP1L
Location and coordinates are for the approximate centre of Silian within this administrative area.
Geographic features and populated places may cross administrative borders.