That is not a metaphor for anything. The site at Tinnatarriff was identified as a possible ring barrow, and the notes on file describe it plainly: the monument is no longer evident in dense undergrowth.

A ring barrow is a low, roughly circular earthwork, typically consisting of a central mound surrounded by a ditch and an outer bank, and is generally associated with Bronze Age burial practice in Ireland. The Tinnatarriff example was not found by fieldwork in the first instance. It was spotted from the air, flagged in aerial photographic survey records as a possible ring barrow under the reference Bruff 10; 4/3733. That kind of identification is common enough for sites in agricultural or forested land, where ground-level visibility is poor but the cropmarks or earthwork shadows visible from above can suggest something buried or partially preserved below. The record was compiled by Denis Power and uploaded in October 2013, at which point the surrounding coniferous forestry had been recently planted. The site sits on a gentle slope running down to the south-west toward the Mulkear valley, and the notes suggest that before the trees closed in, there were good views in all directions, which is itself a fairly typical characteristic of barrow sites, many of which were deliberately placed on elevated or open ground.

Access is complicated by the forestry, and there is little to guide a visitor even if they were to reach the right spot. Dense undergrowth has obscured whatever earthwork survives, and without specialist survey equipment or a dramatic change in vegetation, it is unlikely to resolve itself into anything visually obvious. The Mulkear valley itself is worth knowing about as a broader landscape; the river drains a stretch of south County Limerick with several recorded archaeological sites in its catchment. For anyone with a particular interest in aerial archaeology or in sites that exist primarily as administrative records rather than physical experiences, this one is a useful reminder that the archaeological map of Ireland contains many entries that are more question than answer.