Officially recorded as a ringfort, a category that typically denotes an enclosed farmstead of the early medieval period, the monument at Leny lacks the one feature that would justify that classification: a bank around the edge of its platform. When surveyed in 2012, the researcher David McGuinness argued it should instead be reclassified as a platform-barrow, a low raised mound associated with burial rather than habitation. The distinction matters. What looks, on paper, like a defended farmstead may in fact be a prehistoric funerary monument that has been quietly misidentified on official records.

The monument itself is a low, circular dished platform, 38 metres across in both directions, surrounded by a ditch that varies between 2.5 and 3.5 metres in width. The dished quality is most pronounced in the south-west quadrant, and on the south-east side the ditch survives to a depth of 0.68 metres below the level of the platform. The surrounding ground is broadly level except to the east-south-east, where the hill drops away sharply and the ditch nearly disappears, though the platform itself rises 1.6 metres above the external ground level on that side. The local name for the place, recorded by the landowner Eddie Tormey, is 'The Holding Fort', a name rooted in a tradition of cattle-rustling that echoes the great mythological cattle-raid of the Táin Bó Cúailnge. A similar local tradition was recorded by Macalister and Murray in 1931 and 1932 at Rathbennett, roughly a kilometre to the south. At the north-west edge of the platform stand the ruined foundations of a rectangular house, measuring 10 by 5.5 metres, which Tormey recalls as always having been a ruin; local tradition held it to be a dwelling connected with the fort. A possible causeway leads away from the platform near the house, though this feature may owe more to disturbance from the building than to any original design.

The monument sits within a wider landscape dense with earthworks. A flat-topped mound surrounded by a ditch lies just 31 metres to the west-north-west on the same hill summit, and a ring-barrow, a low circular burial mound enclosed by a ditch, occupies the far end of the elongated hill-top about 250 metres to the south. Frewin Hill is visible to the south, and a barrow at Fulmort stands out on the ridge to the north-east. Whatever the correct classification of the Leny monument, it sits within a cluster of prehistoric features that suggests this hilltop was considered significant long before anyone thought to give it a name.