Ancient Monuments

History on the Ground

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Nant Mawr Round Cairn

A Scheduled Monument in Glyn Tarell, Powys

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Latitude: 51.8659 / 51°51'57"N

Longitude: -3.5214 / 3°31'17"W

OS Eastings: 295337

OS Northings: 219689

OS Grid: SN953196

Mapcode National: GBR YH.SR4N

Mapcode Global: VH5FT.XC7F

Entry Name: Nant Mawr Round Cairn

Scheduled Date: 20 March 2001

Source: Cadw

Source ID: 1678

Cadw Legacy ID: BR285

Schedule Class: Religious, Ritual and Funerary

Category: Round cairn

Period: Prehistoric

County: Powys

Community: Glyn Tarell

Traditional County: Brecknockshire


The monument comprises the remains a burial cairn, probably dating to the Bronze Age (c. 2300 - 800 BC). The cairn is of medium sized stone blocks and measures 12m in diameter and stands to a height of up to 1.2m. There is a robber hole in the centre of the cairn, though it appears otherwise undisturbed.

The monument is of national importance for its potential to enhance our knowledge of prehistoric burial and ritual practices. The 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, together with environmental and structural evidence. Cairns 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. It is circular with a diameter of 20m, centred on the cairn.

Source: Cadw

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