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|Grid Reference||SH 70719 07158|
|Secondary Source||Merionethshire: An Inventory of the Ancient Monuments in the County By Royal Commission on the Ancient and Historical Monuments of Wales, 1921|
|Notes||Valley of a small stream, spelled 'Nant Iago' in OS Map, 'Glyn Iaga' in original 1in sheet and 'Glyn Iage' by Lhuyd. Transcribed from RCAHMW Inventory by student volunteers on 27/03/2017.|