Tŷ Mawr (sometimes Ty Mawr) means "big house" in Welsh and may refer to the following historical houses or areas in Wales: Tŷ Mawr, Castle Caereinion in Powys Tŷ Mawr, Dingestow in Monmouthshire Tŷ Mawr Wybrnant, a National Trust property in Conwy County Borough Caeau Ty-mawr, a Site of Special Scientific Interest in Brecknock, Powys Holyhead Mountain Hut Circles (), a group of prehistoric dwellings on Holy Island, Anglesey Ty Mawr Burial Chamber, a dolmen in Anglesey, Wales Tŷ Mawr, Wrexham, a country park in Wrexham County Borough Ty Mawr Reservoir, a reservoir in Wrexham County Borough Tŷ-Mawr Lime Ltd, a supplier of historic lime-based construction supplies.
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