Dinefwr Park National Nature Reserve

Dinefwr Castle (also known as Old Dynevor Castle) is a ruined castle overlooking the River Towy near the town of Llandeilo, Carmarthenshire, Wales. It lies on a ridge on the northern bank of the Towy, with a steep drop of one hundred feet to the river. Dinefwr was the chief seat of the Dinefwr dynasty of the Kingdom of Deheubarth. The castle is a Grade I listed building.

Deheubarth (Welsh pronunciation: [dɛˈhəɨbarθ]; lit. 'Right-hand Part', thus 'the South') was a regional name for the realms of south Wales, particularly as opposed to Gwynedd (Latin: Venedotia). It is now used as a shorthand for the various realms united under the House of Dinefwr, but that Deheubarth itself was not considered a proper kingdom on the model of Gwynedd, Powys, or Dyfed is shown by its rendering in Latin as dextralis pars or as Britonnes dexterales ("the Southern Britons") and not as a named land. In the oldest British writers, Deheubarth was used for all of modern Wales to distinguish it from Hen Ogledd (Y Gogledd), the northern lands whence Cunedda originated.

Dinefwr was one of six local government districts of the county of Dyfed, Wales from 1974 to 1996. It was named after Dinefwr Castle which in the Middle Ages had been the court of the House of Dinefwr and one of the three principal royal courts of Wales with Aberffraw and Shrewsbury.

Newton House is a Grade II* listed country house situated just to the west of the market town of Llandeilo in Carmarthenshire, Wales. It is partially owned and maintained by the National Trust and lies within Dinefwr Park (sometimes anglicised as "Dynevor") and the grounds of Dinefwr Castle. The park and gardens are listed on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales. The original house was built during the Medieval period on a site which has been occupied for at least two millennia. The current house was built by Edward Rice in the Jacobean style in 1660, though extensive changes were made in the 1850s in the Venetian Gothic style. The house played a role in the Rebecca Riots of 1843, when the occupant of the house at the time, Colonel George Rice, received a death threat with an empty grave dug in the ground. After 1956 the property fell into turbulent times when two owners died within the space of a few years. It was sold in 1974, and later fell into disrepair; it was occupied by squatters and thieves who removed beams and furniture. The house, along with Dinefwr Castle, have since been restored by the National Trust and Cadw respectively. It is a three-storey castellated structure, built from grey stone, with four tall towers in each corner, with sloping slate roofs. The front features a grand central porch. Two rooms are open to the public, including a tearoom and exhibition in the basement and ground floor which contain numerous displays related to the history of the estate and occupants. The deer park which surrounds the property was landscaped by Capability Brown in 1775. The surrounding woodland consists mainly of oak and wych elm. Newton House is cited as one of the most haunted houses in Wales, noted in particular for its ghost of Walter the Butler, a former employee whose tobacco smoke purportedly wafts through the air.

St Tyfi's Church is the former parish church of Llandyfeisant, near Llandeilo and part of the Dinefwr Park estate in Carmarthenshire, Wales. It was dedicated to the Welsh saint Tyfei, nephew of Saint Teilo.

Ysgol Bro Dinefwr is a bilingual secondary school for pupils aged 11–19 in Ffairfach, Carmarthenshire. As of 2016, the school had 1,182 pupils on roll, with approximately 200 of those pupils in the sixth form.

Birdshill Quarry is a Site of Special Scientific Interest (SSSI) in Carmarthenshire, Wales.

The Battle of Llandeilo Fawr took place during the conquest of Wales by Edward I, at Llandeilo between an English army led by Gilbert de Clare, 6th Earl of Hertford, and a south Welsh army.

Llandeilo Bridge (Welsh: Pont Llandeilo) is a Grade II* listed road bridge crossing the River Towy in Llandeilo, Carmarthenshire, Wales. It carries the main A483 road towards Ffairfach.

Llandilo Bridge railway station served the town of Llandeilo, in the historical county of Carmarthenshire, Wales, from 1865 to 1963 on the Llanelly Railway.

Crûg Farm Quarry is a Site of Special Scientific Interest (SSSI) in Carmarthenshire, Wales, for the geological records preserved in its limestone.

Ffairfach is a village one-half mile (0.80 km) south of the market town of Llandeilo in the eastern part of Carmarthenshire, Wales. It is close to the confluence of the Afon Cennen and the River Towy. Population is 516 according to 2017 census.