That kind of slow interference from the landscape is part of what makes this rath in the Glen townland of County Limerick worth a closer look. A rath, to use the term as it was understood in early medieval Ireland, is a roughly circular enclosure defined by a bank and outer ditch, most likely the enclosed farmstead of a single family or petty landowner, dating broadly to the period between the sixth and tenth centuries. This one sits on a west-northwest-facing slope in rough pasture, and its unusual character comes not just from the stream but from what surrounds it.

When the Archaeological Survey of Ireland visited and recorded the monument in 2008, they found a circular area roughly 22 metres in diameter. The enclosing bank survives reasonably well on the eastern, southern, and western sides, reaching an external height of around 1.8 metres and a width of over 7 metres in places, though on the northern arc it has been worn down to a steep scarp rather than a proper bank. The fosse, the external ditch that would originally have reinforced the bank, is still legible across the southern and western sides, and it is here that the stream appears to have followed and deepened the old cut on its way around the northern edge. An added curiosity is a subrectangular enclosure, defined by low linear banks, that abuts the outside of the fosse to the west, its eastern bank possibly sharing ground with the outer edge of the ringfort itself. This kind of annexe is relatively unusual and may have served as a stock enclosure or a working yard. Beyond the ringfort, within roughly 65 metres to the south, southwest, and west, lie five barrows, which are burial mounds of probable prehistoric date, and within the southern interior of the rath itself there is a possible hut site. The site was already captured on the Ordnance Survey 25-inch map of 1897, where it appears as a suboval earthwork with the watercourse marked to its north.

The townland of Glen sits in the barony of Clanwilliam, and the monument lies about 130 metres northeast of the boundary with Knocknacrohy townland. The ground is rough pasture, so sturdy footwear is advisable, and the slope and stream mean conditions underfoot can be soft after rain. Aerial imagery from multiple surveys between 2005 and 2018 confirms the earthwork is still clearly legible from above, which gives some sense of how much of the original form survives despite the stream's interventions. The barrow complex to the south and west is worth looking for once the ringfort itself has been taken in; the proximity of prehistoric funerary monuments to an early medieval settlement site suggests this corner of Limerick was meaningful ground across a very long stretch of time.