- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°2'1"N 4°13'5"W
- Eastings/Northings: 251351, 350808
- OS Grid: SH513508
- Mapcode Local: GBR 5L.DV39
- Mapcode Global: WH555.50KK
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.