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Allt-y-Grag, a hamlet, in the parish of Llanguicke, union of Neath, hundred of Llangyvlach, county of Glamorgan, South Wales, 10 miles (N. by W.) from Neath; containing 1077 inhabitants. It forms the higher and north-eastern portion of the parish, bordering on Brecknockshire, and is intersected by the Swansea canal at its eastern extremity.

Source: A Topographical Dictionary of Wales by Samuel Lewis Third Edition Published London; by S. Lewis and Co., 13, Finsbury Place, South. M. DCCC. XLV.