Carnedd y Ddelw is a summit in the Carneddau

Carneddau

The Carneddau , are a group of mountains in Snowdonia, Wales. It includes the largest contiguous areas of high ground in Wales and England, as well as six or seven of the highest peaks in the country—the Fourteen Peaks...

 mountains in north Wales

North Wales

North Wales is the northernmost unofficial region of Wales. It is bordered to the south by the counties of Ceredigion and Powys in Mid Wales and to the east by the counties of Shropshire in the West Midlands and Cheshire in North West England...

, north-east of Foel-fras

Foel-fras

Foel-fras is a mountain in the Carneddau range, about 10 km east of Bethesda in North Wales. It lies on the border between the counties of Gwynedd and Conwy...

. It is the Nuttall top of Drum (Wales)

Drum (Wales)

Drum is a summit in the Carneddau mountains in north Wales, 2 km north-east of Foel-fras. It is 770 m high. It is also known as Carnedd Penyborth-Goch....

.
Its eastern slopes are drained by the Afon Tafolog

Afon Tafolog

The Afon Tafalog is a small river in Snowdonia, north Wales. It is fed by a number of streams which drain the eastern slopes of Drum, a mountain in the Carneddau range....

, a tributary of Afon Roe

Afon Roe

The Afon Roe is a small river in Snowdonia, north Wales.Its tributary is the Afon Tafolog, which drains the eastern slopes of Drum, a mountain in the Carneddau range.The river flows through the village of Rowen before joining the River Conwy....

 which flows through the village of Rowen before joining the River Conwy

River Conwy

The River Conwy is a river in north Wales. From its source to its discharge in Conwy Bay it is a little over long. "Conwy" is sometimes Anglicized as "Conway."...

. It is also the final top on Carnedd Llewelyn

Carnedd Llewelyn

Carnedd Llewelyn, usually spelt Carnedd Llywelyn in Welsh, is a mountain massif in the Carneddau range in Snowdonia, north-west Wales...

's long northern spur. To the north-west is Tal y Fan

Tal y Fan

Tal y Fan is an outlying peak of the Carneddau mountains in North Wales. It is one of the four Marilyns that make up the Carneddau, the others being Carnedd Llywelyn, Pen Llithrig y Wrach and Creigiau Gleision....

, the most northerly 2000 ft mountain in the Carneddau

Carneddau

The Carneddau , are a group of mountains in Snowdonia, Wales. It includes the largest contiguous areas of high ground in Wales and England, as well as six or seven of the highest peaks in the country—the Fourteen Peaks...

 and Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. The summit has two large shelter cairns; hollowed out from a large Bronze Age burial cairn.