It measures approximately 43 metres north to south and 34 metres east to west, its earthen banks rising just over a metre above the exterior ground level, worn down to about 40 centimetres on the inside. That modest scale, combined with the gentle northward slope of the interior and the absence of any obvious structural remains, makes it easy to dismiss. Local tradition, however, identifies this as the site of a church, and once that possibility is in mind, the landscape begins to arrange itself differently.

The earthwork has several features worth reading carefully. There are two gaps in the southern side of the enclosure, one at the south-west corner and one at the south-east, each with the flanking bank extending slightly beyond the enclosure boundary, as though framing a formal entrance. A short stretch of the western bank also turns inward, a detail that sometimes indicates an internal subdivision or passageway. To the south-east lies a separate small oval enclosure, roughly 16 by 11 metres, its low bank surrounding a scatter of stones. This kind of secondary enclosure adjacent to an ecclesiastical site is not unusual in the Irish early medieval landscape, where burial grounds, ancillary structures, or garden plots often clustered around a central church. Further to the north, on the far side of a levelled field boundary, two parallel earthen banks run downhill toward a stream, separated by about 6.8 metres, with a shallow fosse along the eastern side of the eastern bank. Whether these are related to the enclosure or represent a distinct feature of the landholding is unclear, though their alignment and context suggest they are part of the same general complex.

The site sits in working pasture above a stream valley, and without signage or formal access, it requires some care to locate. The banks are low and unexcavated, so there is nothing dramatic to see on the surface, but the combination of the main enclosure, the oval annexe with its stones, and the paired banks to the north makes Tinnascart worth attention as a landscape where several distinct elements appear to have accumulated over time around a now-vanished place of worship.