Llyn yr Oerfel, Gwynedd

• Parish/Community: Maentwrog
• Unitary Authority: Gwynedd
• Region: Wales

• Category: Water Feature
• Type: Inland Water

• Latitude/Longitude: 52°55'55"N 3°55'1"W
• Eastings/Northings: 271252, 338922
• OS Grid: SH712389
• Mapcode Local: GBR 5Z.M90N
• Mapcode Global: WH55P.SKZG

Location and coordinates are for the approximate centre of Llyn yr Oerfel within this administrative area. Geographic features and populated places may cross administrative borders.