What makes the site at Lettergorman quietly puzzling is that only three of those corners are still occupied, yet the spacing and orientation of the surviving uprights make the original intention clear enough. Set on level pasture along a ridge in West Cork, with the valley of the Glashagloragh river opening to the south, the stones stand in a configuration that implies a fourth member is simply missing, absorbed back into the field or long since removed.

The three remaining stones vary considerably in scale. The tallest, at the north-west corner, rises to three metres and measures 1.6 metres in length and 0.75 metres in thickness, making it a substantial presence in an otherwise open pastoral setting. Aligned with it and 3.75 metres to the south-east is a second stone, 2.15 metres high, while a third stands 1.4 metres to the east of the first, reaching 2.1 metres. Together they trace out the trapezium that gives the monument type its name. About 18 metres further east, beside a laneway, lies a prostrate stone measuring 1.6 metres by 0.7 metres, but there is no evidence it was ever part of the arrangement. A separate standing stone lies roughly 45 metres to the west, recorded by Seán Ó Nualláin in 1984, who catalogued the group. Four-poster arrangements are a recognised prehistoric monument type found across Ireland and Britain, generally associated with the Bronze Age, though their precise function remains debated. The proximity of an independent standing stone adds a further layer of interest to the immediate landscape, suggesting this ridge carried some significance over an extended period.