51°40′12″N 4°00′32″W / 51.670°N 4.009°W Penllergare is a country park in Wales. It was the estate of John Dillwyn Llewelyn adjacent to what is now the village of Penllergaer, Swansea. Although the names are similar, the village of Penllergaer grew up as a separate entity from the Penllergare estate. The park is listed on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.