Ancient Monuments

History on the Ground

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Mounds on the Island

A Scheduled Monument in Martletwy, Pembrokeshire (Sir Benfro)

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Latitude: 51.7898 / 51°47'23"N

Longitude: -4.8531 / 4°51'11"W

OS Eastings: 203324

OS Northings: 213983

OS Grid: SN033139

Mapcode National: GBR CQ.YJVK

Mapcode Global: VH1RN.T8PR

Entry Name: Mounds on the Island

Scheduled Date: 17 June 1952

Source: Cadw

Source ID: 462

Cadw Legacy ID: PE276

Schedule Class: Unassigned

Category: Mound

Period: Medieval

County: Pembrokeshire (Sir Benfro)

Community: Martletwy

Traditional County: Pembrokeshire


The monument consists of two mounds, an artificial elevation of earth or stones. The mounds are located on a little peninsula jetting out into the Eastern Cleddan which becomes an island at high tide. The mounds are about 8ft high and measure 35ft across the top.

The monument is of national importance for its potential to enhance our knowledge of construction techniques. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. A mound 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

Other nearby scheduled monuments is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact for any queries related to any individual ancient or schedued monument, planning permission related to scheduled monuments or the scheduling process itself. is a Good Stuff website.