- Category: Water Feature
- Type: Island
- Latitude/Longitude: 59°57'10"N 1°21'11"W
- Eastings/Northings: 436236, 1118850
- OS Grid: HU362188
- Mapcode Local: GBR R20F.GP2
- Mapcode Global: XHD48.S3B6
Location and coordinates are for the approximate centre of Twalve-pund Stack within this administrative area.
Geographic features and populated places may cross administrative borders.