- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 54°44'58"N 2°28'31"W
- Eastings/Northings: 369500, 539500
- OS Grid: NY695395
- Mapcode Local: GBR CF4J.W6
- Mapcode Global: WH920.YWFB
Location and coordinates are for the approximate centre of Greencastle Tarn within this administrative area.
Geographic features and populated places may cross administrative borders.