Dinefwr Park National Nature Reserve lies about 1.5 kilometres from the centre of Llandeilo in Carmarthenshire.
The only parkland National Nature Reserve in Wales, it has valley views and a chance to see fallow deer and rare white park cattle throughout the year. The latter have been present in the area for over a thousand years, and make appearances in certain Welsh medieval texts.
The estate slopes down to the level fields of the River Towy floodplain, where small lakes lend interest to the landscape.
Dinefwr Castle and Newton House are situated in the grounds of the park.