Dyffryn Cellwen is a village in the County Borough of Neath Port Talbot

Neath Port Talbot

Neath Port Talbot is a county borough and one of the unitary authority areas of Wales. Neath Port Talbot is the 8th most populous county in Wales and the third most populous county borough....

, South Wales

South Wales

South Wales is an area of Wales bordered by England and the Bristol Channel to the east and south, and Mid Wales and West Wales to the north and west. The most densely populated region in the south-west of the United Kingdom, it is home to around 2.1 million people and includes the capital city of...

. It is situated in the upper Dulais Valley

Dulais Valley

The Dulais Valley, one of the South Wales Valleys is traversed by the River Dulais in southwest Wales north of the town of Neath.Settlements in the valley include Crynant, Seven Sisters, Banwen and Dyffryn Cellwen which are served by the A4109 road though the valley.The towns in the valley...

 near the junction of the A4109

A4109 road

The A4109 road links Aberdulais with Glynneath in Neath Port Talbot county borough, Wales.The route begins in Aberdulais at the junction with the A4230 and A465 roads; it diverges northwards away from the A465 up the Dulais Valley and crosses through the settlements of Crynant, Ynysfforch, Seven...

 and A4221

A4221 road

The A4221 is an A road which links Banwen with Abercraf in Wales.The roads begins just south of Abercraf at the junction with the A4067. It then heads eastwards through Caehopkin and then bypasses Coelbren. It joins the A4109 just west of Banwen....

 roads, northwest of the smaller settlement of Banwen

Banwen

Banwen is a small village in Neath Port Talbot county borough in Wales. Banwen is part of the community of Onllwyn along with the village of Onllwyn itself and the adjacent parish of Dyffryn Cellwen...

. It is part of the community

Community (Wales)

A community is a division of land in Wales that forms the lowest-tier of local government in Wales. Welsh communities are analogous to civil parishes in England....

 of Onllwyn

Onllwyn

Onllwyn is a small village in Neath Port Talbot, Wales, near Seven Sisters.-History:First developed by the Romans, local village Banwen is confined to the Roman Road of Sarn Helen. There are two Roman forts and the remains of a Roman Road within the community.Legend has it that St Patrick was born...

.

The village stands close to the course of the Roman road from Neath

Neath

Neath is a town and community situated in the principal area of Neath Port Talbot, Wales, UK with a population of approximately 45,898 in 2001...

 to Brecon

Brecon

Brecon is a long-established market town and community in southern Powys, Mid Wales, with a population of 7,901. It was the county town of the historic county of Brecknockshire; although its role as such was eclipsed with the formation of Powys, it remains an important local centre...

, and there are traces of a Roman fort and camp nearby. At one time, mining

Mining

Mining is the extraction of valuable minerals or other geological materials from the earth, from an ore body, vein or seam. The term also includes the removal of soil. Materials recovered by mining include base metals, precious metals, iron, uranium, coal, diamonds, limestone, oil shale, rock...

for iron, copper, and especially coal were important activities in the area.