It is easy to miss. The bank that defines it has been largely levelled, and a drainage ditch has cut straight through the monument, carrying a field boundary with it. What remains is a semi-circular form, roughly nineteen metres along its longer axis and eight metres across, with just enough surviving earthwork to suggest its original shape to someone looking carefully at the lie of the land.

Enclosures of this kind, broadly circular or oval areas defined by a bank and sometimes a ditch, are among the most common archaeological monuments in Ireland, though their purposes varied considerably. Some were settlement enclosures, others may have had agricultural or ritual functions. At Lissobihane, the surviving bank reaches only about twenty centimetres above the interior ground level in the south-east quadrant, and the opposing arc to the north has been reduced to a barely perceptible trace. The interior is slightly elevated at its centre, falling gently towards the drain to the west. A second shallow drain runs close to the southern edge. These drainage works, almost certainly introduced during agricultural improvement of the low-lying ground, are what have done most of the damage, truncating the monument and erasing what would once have been a more legible boundary between the enclosed space and the fields around it.