It looks, at first glance, like a very modest enclosure, the kind of thing a walker might step over without a second thought. But the small circular platform rising from the centre, a dry island in what was once a managed body of water, gives the game away. This is the ghost of a fish-pond, a feature once associated with the provisioning and landscaping of a landed estate, now drained and bisected by a modern road.

Fish-ponds of this kind were a practical luxury, constructed to keep live fish, typically for a household's table, within easy reach of a country house. The pond at Caherass was likely connected to the demesne of Caherass Court, located some 850 metres to the south, and may have formed part of the same programme of landscaping that produced Morrisey Wood, a plantation that still stands about 40 metres to the east of the site. When the Archaeological Survey of Ireland inspected the earthwork in 2000, they recorded a flat-topped bank some 7.2 metres wide enclosing a roughly D-shaped area measuring about 135 metres north to south and 115 metres east to west, with a straight southern edge roughly 100 metres long. The central island platform measures around 12 metres in diameter. Curiously, the feature does not appear on the Ordnance Survey six-inch map of 1840, but is clearly marked on the 25-inch edition of 1897, where it is already labelled "Old Fish Pond", a designation that hints the earthwork may in fact predate the nineteenth century, possibly originating in the seventeenth or eighteenth. Whether it was newly constructed or already old when the Victorian surveyors came through remains an open question.

The site sits in ordinary agricultural pasture at the base of a gentle east-facing slope, with a ringfort visible about 110 metres to the west. A small concrete pump house, roughly three metres square, occupies the north-west corner of the pond's interior, a more recent intrusion. The southern bank has been largely lost to the road that now runs along its original line, but the earthen bank remains legible from the west, north, and east. The interior tends to be waterlogged, so firm footwear is sensible. The earthwork is clearly visible on satellite imagery if you want to orientate yourself before visiting.