It sits on a coastal promontory, barely half a metre high and no more than twelve metres across at its widest point. What makes it quietly remarkable is what it may once have been: a passage tomb, a type of Neolithic monument in which a stone-lined corridor leads to a burial chamber, typically covered by a round mound of earth and stone. This one, however, offers few easy answers. A geophysical survey carried out in 2006 under licence by Gimson returned no specific structural detail, and the disturbed core of the mound appears to consist largely of water-rolled beach material, suggesting long centuries of coastal interference with whatever once lay beneath.

The mound is identified as Mound III within the Bremore cemetery, a grouping of monuments first documented by Rynne in 1960. It was listed as a possible passage tomb by Herity in 1974, a classification that remains cautious rather than definitive. Possible kerbstones, the upright stones that would once have defined the outer edge of a passage tomb mound, are visible along its northern edge, which is one of the more suggestive details for those inclined to read the landscape carefully. The site has attracted academic and commercial attention in more recent years: Margaret Gowen and Company Ltd. carried out a constraint study in anticipation of a proposed port development in the area, and fieldwalking and lithic analysis, the study of stone tools and worked flint collected from the surface, were undertaken as part of an MA study by Collins in 2007. The monument is protected under a preservation order made under the National Monuments Acts 1930 to 2014.

Bremore is situated on the coast north of Balbriggan, and the promontory setting means the mound is exposed to the elements year-round. The proximity to the shoreline is both part of its atmosphere and a reminder of why the site is so difficult to read; coastal erosion and disturbance have worked on it for millennia. Visitors should look for the faint outline of the mound against the wider landscape and, along its northern side, the stones that may once have formed its kerb. The site rewards patience and a willingness to sit with uncertainty, since this is a place whose prehistory remains, in the most literal sense, beneath the surface.