- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°1'40"N 4°8'44"W
- Eastings/Northings: 256195, 349984
- OS Grid: SH561499
- Mapcode Local: GBR 5P.F7DJ
- Mapcode Global: WH556.9524
Location and coordinates are for the approximate centre of Llyn Llywelyn within this administrative area.
Geographic features and populated places may cross administrative borders.