- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 57°39'53"N 2°11'48"W
- Eastings/Northings: 388351, 863891
- OS Grid: NJ883638
- Mapcode Local: GBR N8YG.D7C
- Mapcode Global: WH9N5.7L3Y
Location and coordinates are for the approximate centre of Mary Den within this administrative area.
Geographic features and populated places may cross administrative borders.