What makes it quietly arresting is not its size but its completeness: the circular bank, the surrounding ditch, and even the original entrance causeway are all still legible in the landscape, as if the people who built it had simply walked away.

The monument is a ring barrow, a type of prehistoric funerary enclosure in which a burial, or sometimes multiple burials, was placed within a circular area defined by a fosse (a ditch cut into the ground) and an earthen bank thrown up on the outer side. At Tubrid Beg, the enclosed area measures 7.4 metres from north to south. The external face of the bank stands 1.7 metres high, with a base width of 4.7 metres, while the interior rises to about 1.5 metres above the floor of the fosse. What gives this particular example its character is the entrance on the south-eastern side: a gap 3.2 metres wide with a causeway, 1.6 metres across, that bridges the fosse and leads into the interior. That causeway is not a later addition or a gap worn by cattle; it is an original, deliberate feature, which means whoever designed this enclosure also thought carefully about how it would be approached and entered. The site is noted as the second of a pair, implying a companion monument nearby, though the two together have attracted little of the attention that Kerry's more prominent prehistoric sites receive. The details recorded here come from C. Toal's North Kerry Archaeological Survey, published in 1995.

The survival of the causeway and the crispness of the earthworks are what a visitor should look for. Ring barrows can often read as little more than a vague swelling in a field, but the defined fosse and the intact entrance at Tubrid Beg give it a three-dimensional quality that rewards a slow walk around the perimeter.