Ancient Monuments

History on the Ground

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Bwlch yr Avan Dyke

A Scheduled Monument in Ogmore Valley (Cwm Ogwr), Bridgend (Pen-y-bont ar Ogwr)

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Latitude: 51.6444 / 51°38'39"N

Longitude: -3.5618 / 3°33'42"W

OS Eastings: 292032

OS Northings: 195113

OS Grid: SS920951

Mapcode National: GBR HF.7LS9

Mapcode Global: VH5GS.6XWR

Entry Name: Bwlch yr Avan Dyke

Scheduled Date:

Source: Cadw

Source ID: 399

Cadw Legacy ID: GM246

Schedule Class: Monument

Category: Dyke

Period: Prehistoric

County: Bridgend (Pen-y-bont ar Ogwr)

Community: Ogmore Valley (Cwm Ogwr)

Built-Up Area: Nant-y-moel

Traditional County: Glamorgan


The monument consists of the remains of a dyke, a defensive boundary or earthwork, dating to the later prehistoric or medieval period. It measures approx. 155m long, running east-west across the top of the ridge on open moorland. It comprises a ditch with turf-covered banks on both sides, the northern one being somewhat slighter than that on the southern side. The northernmost bank measures 1.2m high and the southern 1.5m high.

The monument is of national importance for its potential to enhance our knowledge of later prehistoric/medieval defensive organisation and settlement. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. A dyke may be part of a larger cluster of monuments and their importance can further enhanced by their group value.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

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