Black Mountains, United Kingdom

The Vale of Grwyney is a community in Powys, Wales. It follows most of the border between Powys and Monmouthshire. It takes its name from the river Grwyney (in Welsh, Grwyne) which flows through it into the River Usk. The river Grwyney has two tributaries, called the Grwyne Fechan and the Grywne Fawr, which both rise in the Black Mountains and converge into one river near Llanbedr before meeting the Usk at Glangrwyney. The community includes the villages of Glangrwyney, Llangenny, and Llanbedr. In 2011 the population of The Vale of Grwyney was 738 with 9.4% of them able to speak Welsh. The community is part of the Crickhowell electoral ward and sends a county councillor to sit on Powys County Council. 30 miles (48 km) from Cardiff and 130 miles (210 km) from London.

Chwarel y Fan is a peak in the Black Mountains in south-eastern Wales. It is the highest rise on the long ridge which extends southeastwards from Rhos Dirion. The ridge continues southeastwards to the lesser summit of Bal-Mawr whose top is adorned by a trig point at 607 metres (1,991 ft) above sea level. About one km (0.62 mi) southeast along the ridge is the lesser top of Bal-Bach at a height of just over 520 metres (1,710 ft). Chwarel y Fan is the county top of the historic county of Monmouthshire, and is also the highest point in the current local government area of Monmouthshire. The summit is on a thin ridge and is crowned by a cairn. On the other sides of the valleys: to the west is Pen Twyn Mawr and to the east is Black Mountain.

The Grwyne Fawr Reservoir is located in the valley of the river Grwyne Fawr in the Brecon Beacons National Park, Wales. Completed in 1928, it has the capacity to hold 400,000,000 imperial gallons (1,800 megalitres).

Llanthony Abbey is a former Anglican monastic institution founded in 1869 by Joseph Leycester Lyne (Father Ignatius), in the Welsh village of Capel-y-ffin, a few miles from the medieval Llanthony Priory. It survived until 1908, after which it was the home of artist Eric Gill. It is now holiday accommodation. It was also known as Llanthony Tertia - following on from the nearby original medieval Llanthony Priory, and its Gloucestershire offshoot Llanthony Secunda - or New Llanthony Abbey. The surviving buildings are now referred to as Capel-y-ffin Monastery.

Crug Mawr is a hill in the Black Mountains in the Brecon Beacons National Park in southern Powys, Wales. Its summit at a height of 550 m (1,805 ft) is marked by a trig point. The peak sits high above the valleys of the Grwyne Fawr and Grwyne Fechan to the north of the more well-known Sugar Loaf. The views from here across the Black Mountains are wide-ranging and also extend eastwards across Monmouthshire. Four ridges run off to the northwest, east, southeast and southwest, the last ending in the subsidiary summit of Blaen-yr-henbant.

Capel-y-ffin (Welsh for 'chapel of the boundary') is a hamlet near the English-Welsh border, a couple of miles north of Llanthony in Powys, Wales. It lies within the Black Mountains and within the Brecon Beacons National Park. The nearest town is Hay-on-Wye, some 8 miles (13 km) to the northwest.

Pen Cerrig-calch is a subsidiary summit of Waun Fach in the Black Mountains in the Brecon Beacons National Park in southern Powys, Wales. Its summit, at a height of 701 m (2,300 ft), is marked by a trig point. The peak sits high above the River Usk valley as it narrows above the small town of Crickhowell. The views from here are wide-ranging and extend as far as the Beacons themselves to the west. A ridge runs off to the northwest and the shoulder of Pen Gloch-y-pibwr then turns north to the secondary top of Pen Allt-mawr whose peak at 719m is also crowned by a trig point.

Llanbedr is a small village 2 miles (3 km) northeast of Crickhowell in the county of Powys, Wales and the community of Vale of Grwyney. It lies above the river known as the Grwyne Fechan just above its confluence with the Grwyne Fawr in the southern reaches of the Black Mountains range. The village lies within the shadow of Table Mountain, an outlying spur of Pen Cerrig-calch on which is perched the Iron Age hill fort of Crug Hywel.The church of St Peter is a grade II* listed building.

Crug Hywel is an Iron Age Celtic hillfort, with a clearly visible earth and stone ditch and rampart. Crug Hywel is approached by a couple of public footpaths across farmland from Crickhowell and Llanbedr and visited by the Beacons Way. It lies within an area designated as open country over which the public have the right to roam. The name is sometimes given to the flat-topped hill itself, which is also called Table Mountain in English. Located at the southern edge of the Black Mountains in south-east Wales, it rises to 451 m above sea level, from the southern flank of Pen Cerrig-calch (701 m), and overlooks the town of Crickhowell, whose name derives from Crug Hywel.The Welsh name Mynydd y Begwn is also used for this summit. As a result, it has been suggested that the name Crug Hywel (which means 'Hywel's mound') may originally have referred to the castle mound in Crickhowell.

Cwm Bwchel Farmhouse, Llanthony, Monmouthshire is a farmhouse dating from the late-Medieval period. It carries a date stone of 1694, which probably refers to a period of reconstruction. The farmhouse is Grade II* listed and a number of the ancillary buildings on the farmstead have their own Grade II listings.

The Hatterrall Ridge (sometimes spelled Hatterall) is a ridge in the Black Mountains forming the border between Powys and Monmouthshire in Wales and Herefordshire in England. The ridge is about 10 miles (16 km) long, and is followed by the Offa's Dyke Path. On the west side of the ridge is the Vale of Ewyas, and on the east side is the Olchon Valley and Black Hill. The western side of the ridge falls within the Brecon Beacons National Park. Much of the northern part of the ridge is a broad whaleback, but it narrows down considerably further south, and especially near to Llanthony Priory in the Vale of Ewyas to the west of the mountain. There is a large and prominent landslip on the eastern side of the mountain here, known as Black Darren, where a large slice of the rocks has fallen away from the main mass of the hill. The ridge to the southwest ends abruptly at the sheer cliff known as the Darren below which is a considerable landslide area extending south to the hamlet of Cwmyoy with its misshapen church.

Court Farm Barn, Llanthony Priory, Monmouthshire, is a barn of late medieval origins that forms part of a group of historic buildings in the priory complex. It is a Grade I listed building.