- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°7'31"N 3°15'4"W
- Eastings/Northings: 314438, 248196
- OS Grid: SO144481
- Mapcode Local: GBR YW.864P
- Mapcode Global: VH6B2.LVK1
Location and coordinates are for the approximate centre of Llyn y March within this administrative area.
Geographic features and populated places may cross administrative borders.