Garreg Costog, Isle of Anglesey

• Built-Up Area: Amlwch
• Parish/Community: Amlwch
• Unitary Authority: Isle of Anglesey
• Region: Wales

• Category: Water Feature
• Type: Island

• Latitude/Longitude: 53°25'11"N 4°20'28"W
• Eastings/Northings: 244507, 393996
• OS Grid: SH445939
• Mapcode Local: GBR HMNN.N4M
• Mapcode Global: WH421.89YN

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