- Category: Water Feature
- Type: Island
- Latitude/Longitude: 50°21'8"N 4°26'56"W
- Eastings/Northings: 225881, 53134
- OS Grid: SX258531
- Mapcode Local: GBR NG.W324
- Mapcode Global: FRA 18K3.JLB
Location and coordinates are for the approximate centre of Pen Rocks within this administrative area.
Geographic features and populated places may cross administrative borders.