- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°1'52"N 4°12'57"W
- Eastings/Northings: 251500, 350500
- OS Grid: SH515505
- Mapcode Local: GBR 5L.F2CB
- Mapcode Global: WH555.62PL
Location and coordinates are for the approximate centre of Llynnau Cwm Silyn within this administrative area.
Geographic features and populated places may cross administrative borders.