Cwmdu

Cwmdu is a Welsh place name used for several rural settlements and geographic features across Wales. The name derives from the Welsh cwm, meaning "valley," and du, meaning "black." The combination is a common descriptor in Welsh toponymy, typically applied to a valley with dark rock, soil, or shaded terrain.

In many instances, Cwmdu appears as a basic toponym for a small hamlet or farmstead and may appear in longer forms such as Cwmdu Isaf (lower Cwmdu) or Cwmdu Uchaf (upper Cwmdu) to distinguish related settlements along the same valley.

The places named Cwmdu are generally rural and agricultural in character. Some are associated with historic parish boundaries, chapels, or small rural economies, while others exist primarily as cadastral or land-record names on maps. The exact location and status of each Cwmdu can vary by county and over time, and there is no single town by that name that dominates Welsh geography.

Because Cwmdu is a common toponym, the term may refer to more than one site. When encountered in text or directions, it is advisable to use local context or additional qualifiers (such as a nearby town or parish) to identify which Cwmdu is meant.