The Valley) is a former coal mining village, community and electoral ward three miles (4.8 km) south of Ebbw Vale in the county borough of Blaenau Gwent, Wales, within the historic boundaries of Monmouthshire, United Kingdom.

Originally a rather insignificant spot in the Ebbw Valley, with only a few scattered farms and a water mill until the end of the nineteenth century with the sinking of the Marine Colliery in 1889.

Tirzah Baptist Chapel was built in 1859 in the Simple Gothic style of the gable entry type.

From the Inspector of Mines list 1896, there were 833 men employed producing from the Old coal, Three quarters, Big and Elled seams.

It turned out that his actions saved the lives of the men still alive in the district where the explosion occurred.

At this time there were 1400 men employed at the colliery but fortunately when the explosion occurred only the night shift were working underground.

An incident at Marine Colliery led to an important case in the law of England and Wales.

In 1982 £2.5 million was spent on a new skip winding system, also a new coal handling plant was installed on the surface.

Cwm originally had a secondary school called Dyffryn located at the bottom of the village.