Ancient Monuments

History on the Ground

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Cwmbiga long cairn

A Scheduled Monument in Trefeglwys, Powys

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Latitude: 52.4873 / 52°29'14"N

Longitude: -3.675 / 3°40'29"W

OS Eastings: 286362

OS Northings: 289023

OS Grid: SN863890

Mapcode National: GBR 99.JHT9

Mapcode Global: VH5BN.8R14

Entry Name: Cwmbiga long cairn

Scheduled Date: 9 August 2006

Source: Cadw

Source ID: 1099

Cadw Legacy ID: MG323

Schedule Class: Religious, Ritual and Funerary

Category: Long cairn

Period: Prehistoric

County: Powys

Community: Trefeglwys

Traditional County: Montgomeryshire


The monument comprises the remains of a probable long cairn, dating from the Neolithic period (c. 4,400 BC - 2,900 BC) and situated upon a wide, raised terrace in the centre of a sheltered valley on the east side of the Plynlimon uplands. Cwmbiga long cairn measures overall 17.5m long west-north-west by east-south-east. It is wedge-shaped, and measures 10.5m wide at its south-east end where it is 1m high, and 6m wide at its north-west end where it is 0.75m high. There are no obvious traces of ditching around the cairn. Although the cairn has been disturbed in the past, with two large open trenches visible (presumably the result of antiquarian investigation), the majority of the cairn appears substantially intact.

The monument is of national importance for its potential to enhance our knowledge of prehistoric burial and ritual practices. The well-preserved monument is an important relic of a prehistoric funerary and ritual landscape and retains significant archaeological potential, with a strong probability of the presence of both intact burial or ritual deposits and structural evidence. The surrounding ground is boggy, suggesting that the potential for associated paleoenvironmental evidence is great.

The area scheduled comprises the remains described and an area around them within which related evidence may be expected to survive. It is circular and measures 30m in diameter.

Source: Cadw

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